Spectra watermakers – Watermaker
Photo: lisa bat, CC BY 2.0, via Flickr (cropped)

Spectra Watermakers · Watermaker

Spectra watermakers

Spectra Watermakers of Petaluma, California, part of the Katadyn Group, builds low-energy reverse-osmosis watermakers for cruising yachts. Their heart is the Clark Pump, a pressure intensifier that reuses the pressure of the outgoing brine to lift the feed water to membrane pressure, so a small low-pressure feed pump is enough and the units can run off batteries, solar or wind; it comes in three sizes (7, 10 and 20 %), and most service kits are ordered by that size. The Ventura 150 and 200T and the Cape Horn Xtreme 330 use Shurflo diaphragm feed pumps, while the Catalina 340 (successor of the Catalina 300) and the Newport 400 and 700 use a motor-driven magnetic vane pump with a boost pump; the Newport 1000 is the three-membrane sibling of the 700. Suffixes: D or Deluxe for the analog panel, MPC for the automatic control of 2006–2017, C for Spectra Connect, R for the simple remote, Compact for two 20-inch membranes instead of one 40-inch.

Manuals & documents

The links go straight to Spectra Watermakers. We host no manuals or drawings — the manufacturer’s copy is the current one.

Wear parts & part numbers

PartOEM numberAlso fitsNote
Pump seal kitKIT-S&O1,2,3—Clark Pump 7 % and 10 %: Ventura 150 and 200, Cape Horn Xtreme, Catalina 300/340, Newport 400 (also Bimini, Aquifer). All Clark Pump seals plus grab rings and O-rings for the tube fittings, filter housing O-rings, strainer seals and silicone grease. Spectra’s service bulletin and rebuild manual write it KIT-HP-S&O.
Pump seal kitKIT-S&OH4,2,3—Clark Pump 20 %: Newport 700 and Newport 1000. Bulletin and rebuild manual: KIT-HP-S&OH.
Onboard spares kitKIT-OFFSH5,2,6,7—Offshore kit for a field rebuild of the 7 % and 10 % Clark Pump (Ventura, Cape Horn Xtreme, Catalina, Newport 400; also Bimini, LB400, Aquifer): seal and O-ring kit, annular rings, reversing-valve spool, HP tubing and fittings, SC-2 and SC-3, tools and the rebuild manual. No piston rods or pistons.
Onboard spares kitKIT-OFFSH18,2,9—The same for the 20 % Clark Pump: Newport 700 and Newport 1000.
Spares kitKIT-HP-7UD10,2,3—Rebuild kit for the 7 % Clark Pump: all internal parts except the spacer rings and top-end spool pistons, with parts map and decals, no instructions or tools. Ventura 150 only (also Aquifer 150).
Spares kitKIT-HP-10UD11,2,3—The same for the 10 % Clark Pump: Ventura 200, Cape Horn Xtreme, Catalina, Newport 400 (also Bimini, LB400, Aquifer 200/360).
Spares kitKIT-HP-20UD12,2,3—The same for the 20 % Clark Pump: Newport 700 and Newport 1000.
Pump headPL-PMP-SFPH13,6,14,15—Shurflo feed pump head for every Ventura and the Cape Horn Xtreme (two per system); also the older 180C/280C/380C. Complete wet end with diaphragm drive, check valves and pressure switch, for 12 V and 24 V pumps. Spectra calls it the most important spare for these systems: a worn head no longer reaches about 125 psi within a few seconds with the brine blocked.
Pump assemblyKIT-FP-SF12 · KIT-FP-SF2416,17,15,14,18,19—Complete Shurflo feed pump, 12 V / 24 V, with head, pressure switch and heat sink (no fan), for Ventura and Cape Horn Xtreme. The manuals list the bare pumps as EL-FP-12V / EL-FP-24V; a fan cooling kit is KIT-FK-12 / KIT-FK-24 (not for vane pump systems).
Diaphragm kitEL-FP-DP20,6,21—Shurflo diaphragm drive: restores a worn pump head on the Ventura and Cape Horn Xtreme 330 (also 180C/200C/380C).
Pressure switchEL-FP-PS6,15—High-pressure cut-out switch on the Shurflo head (Ventura, Cape Horn Xtreme), set to cut out at 125 psi. Manual text and Parts ID manual say EL-FP-PS; the Ventura Deluxe parts drawing labels the switch kit KIT-FP-SFSK. If it stops the pump far from port, the two red wires can be bridged to get home, but watch the gauge and stay below 110 psi.
Pump headPL-PMP-140MAG22,23,7,15—Mag-drive vane pump head 140 (140 psi) for the Catalina 340 (340Z, 340C, 340R) and Newport 400 (MKII-Z, 400C); also Bimini 300. Remanufactured exchange: KIT-PMP-140MRF. The Catalina 300 MKII uses a different head whose number Spectra’s documents give in three different ways – confirm it with a dealer.
Pump headPL-PMP-240MAG524,9,15—Mag5-drive vane pump head 240 (250 psi) for the Newport 700 and 1000 (MKII-Z and C). The 700C/1000C manual’s spares list shortens it to PL-PMP-240MAG; remanufactured exchange KIT-PMP-240MRF (Parts ID manual).
Raw water pumpEL-FP-BPLDC82425,23,9—Centrifugal (Laing) boost pump ahead of the vane pump on Catalina 340 and Newport (also Bimini); current production fits two per system.
Raw water pump impellerEL-FP-BPLDC824IM26—Impeller for the EL-FP-BPLDC824 boost pump (Catalina 340, Newport).
Prefilter elementFT-FTC-527,6,7,15,28,14—5 micron, 2.5 × 10 in pleated polyester: the last filter before the Clark Pump on every Ventura (D, C, R, MPC), Cape Horn Xtreme, Catalina 300/340 and Newport 400/700/1000. Optional upstream for harbour use: oil/water separator element FT-FTC-OW (housing kit KIT-FLT-OW), changed together with the 5 micron filter.
Prefilter elementFT-FTC-2029,30,7,9,31—20 micron, 2.5 × 10 in: first stage on the Ventura Connect (150C/200C), Newport 400C and Newport 700C/1000C; fits the same 10 in housings if you add a 20 micron stage on another model.
Charcoal filter elementFT-FTC-CC32,6,9—Carbon block, 2.5 × 10 in, for the fresh-water flush on every model: takes out 99.7 % of the chlorine at up to 1.5 US gal/min.
Inlet strainerFT-STN-5S · FT-STN-6S6,14,15,33,34,7,9—Sea strainer screen 5 in / 6 in. 5 in: Ventura and Cape Horn Xtreme (strainer FT-STN-5), also listed for the Catalina 300 MKII. 6 in: Catalina 340R/340C and Newport 400C/700C. The Catalina 340C manual’s spares list names the 5 in screen, but its parts pages and the 340R manual show the 6 in strainer.
O-ringSO-STN-5SS · SO-STN-6SS6,21,15,34,7,9—Sea strainer O-ring 5 in / 6 in: 5 in for Ventura and Cape Horn Xtreme, 6 in for Catalina 340 and Newport.
O-ringSO-FHS-10H · SO-FHS-3PCS106,14,30,7,9,34—Filter housing O-rings. SO-FHS-10H: high-pressure prefilter housing FT-FTH-10H after the feed pump on Ventura and Cape Horn Xtreme. SO-FHS-3PCS10: 3-piece clear housing FT-FTH-10L3PCS, used for the charcoal filter on every model and for the prefilters on Catalina 340 and Newport. The Catalina 340C manual’s spares list also names SO-FHS-10H; the 340R manual shows the 3-piece housing.
Reverse-osmosis membraneKIT-MB-20F35,6,30,23,15—2.5 × 20 in with seals: one in the Ventura 150/200 (the manuals call it 2.5 × 21 in), two in the Compact versions of the Cape Horn 330, Catalina 340 and Newport 400. Bare element: FT-MB-20F.
Reverse-osmosis membraneKIT-MB-40F36,15,37,38,39—Matched by membrane size – Spectra’s shop gives no model list for this kit. Reverse-osmosis membrane 2.5 × 40 in with seals: one in the Cape Horn 330/330R, Catalina 300 and 340C/340R and Newport 400C, two in the Newport 700, three in the Newport 1000 (sizes from the fact sheets; the Parts ID manual names the bare element FT-MB-40F for the Catalina 300).
Accumulator tankPL-ACC-TK6,23,7—Feed-line accumulator on every model, damps the pressure pulses of the Clark Pump. Precharge with a tyre pump to about 65 psi (4.5 bar) on Ventura and Cape Horn, about 60 psi (4.1 bar) on Catalina and Newport; check it when the Shurflo pump cycles on its pressure switch or the gauge pulses.
Salinity probeEL-MPC-SP440,30,41,23,9,33,42,43—Decides when product water goes to the tank on the Ventura C and R, Catalina 340C and Catalina 300 MKII, Newport 400C/700C. The analog Ventura D/200T, Cape Horn 330/330R and Catalina 340R have none and divert by hand. A handheld salinity meter, KIT-HHM (supplied with the Ventura 150D/200T), checks the product water or calibrates the probe.
Storage & cleaning chemicalsKIT-CHEM-SC1 · KIT-CHEM-SC2 · KIT-CHEM-SC344,45,46,6,9—Spectra chemicals for every system, in this order: SC-1 storage (pickling) chemical, one 8 oz bag per treatment, protects for six months · SC-2 alkaline cleaner against biological growth, oil, grime and leftover propylene glycol · SC-3 acid cleaner against mineral scale.
Service kitKIT-BCK-A47,6,14,34,33—Basic Cruise Kit A: six 5 micron elements, one charcoal element, two bags of SC-1. For Ventura Deluxe and Remote, Cape Horn 330/330R, Catalina 340C/340R and Catalina 300 MKII.
Service kitKIT-BCK-B48,30,7,9—Basic Cruise Kit B: three 5 micron and three 20 micron elements, one charcoal element, two bags of SC-1. For Ventura Connect, Newport 400C and Newport 700C/1000C.

Numbers checked against the sources below on 13 October 2026. Always confirm against your serial number and exact type before ordering.

Service intervals

TaskInterval
Fresh-water washAfter every run; while the unit stands idle, repeat every 5 days (every 30 days with the optional Z-Ion). Connect and MPC units do it themselves in Auto Store mode. Default flush 3 min, set so the brine reads under 1000 ppm at the end. Charcoal flush filter: change at least every 6 months or after about 12000 l (3000 US gal), whichever comes first – it loses effect with age even when little used6
Prefilter change5 and 20 micron prefilters: change when dirty – feed pressure drops, the Connect prefilter graph falls or the pump cuts out. Roughly every 4–6 weeks in clean open-ocean water, within minutes in a dirty harbour; never clean and reuse. Fit new ones before storage and leave the housings dry7
Strainer cleanCheck often while running and clean as needed; before storage rinse with fresh water and reassemble dry6
Storage / winterisingLay-ups longer than the flush interval: one 8 oz bag of SC-1 in a few gallons of fresh product water, circulated with the Clark Pump pressure relief valve open, protects for 6 months, then repeat. Food-grade propylene glycol (60 % or stronger) protects for a year and is needed wherever it can freeze6
Pump sealsClark Pump: no routine maintenance beyond checking for leaks. Fit the seal and O-ring kit when it leaks or the seals are more than 5 years old; rebuild it (offshore or rebuild kit) when a flow test shows recovery below the minimum with a good membrane2
RO membraneReverse-osmosis membrane: clean only when a flow test shows lower output, or after biofouling or propylene glycol storage – SC-3 for scale, SC-2 for biological growth; never as a diagnostic step. Replace it when the ppm stays high at normal pressure and flow (Spectra rates product water under 500 ppm excellent, under 750 ppm acceptable)6,37

From Spectra’s owner’s manuals (Ventura Deluxe and Newport 400C, 2025) and the Clark Pump service bulletin (2020). Spectra gives no hour-based schedule: filters, membrane and Clark Pump are serviced on condition; only the flush, the charcoal filter and storage follow the calendar.

Specifications

ModelsVentura 150 and Ventura 200 (200T analog, 200C, 200R-T) · Cape Horn Xtreme 330 and 330R · Catalina 340C and 340R (before: Catalina 300 MKI/MKII, 340Z) · Newport 400C (before: MKI, MKII, MKII-Z) · Newport 700C (before: MKI to MKII-Z), with the Newport 1000 as its three-membrane sibling. Cape Horn, Catalina 340 and Newport 400 also as Compact49,39
VersionsD / Deluxe: analog panel · MPC: automatic control (2006–2017) · C: Spectra Connect automation · R: simple remote control · Compact: two 2.5 × 20 in membranes instead of one 2.5 × 40 in49,50,37
TypeReverse osmosis with Clark Pump energy recovery. Feed pump: one Shurflo diaphragm pump on the Ventura, two in parallel on the Cape Horn Xtreme; motor-driven magnetic-drive vane pump plus boost pump on Catalina and Newport51,50,37,38,39
SizesClark Pump 7 %: Ventura 150 · 10 %: Ventura 200, Cape Horn 330, Catalina 300/340, Newport 400 · 20 %: Newport 700 and 1000. Recovery (product ÷ feed water) nominal 6.5 / 9 / 18.5 %, minimum 5.5 / 8 / 17.5 %2
Flow rateVentura 150 24 l/h (6.3 US gal/h, 568 l a day) · Ventura 200T 31 l/h (8.3 gal/h, 757 l) · Cape Horn Xtreme 330 56 l/h (15 gal/h, 1249 l), about 33 l/h on one pump · Catalina 340 53 l/h (14 gal/h, 1287 l) · Catalina 300 MKII 42–50 l/h · Newport 400C 64 l/h (17 gal/h, 1514 l) in high mode, about 12 gal/h in low mode · Newport 700C 110 l/h (29 gal/h, 2650 l). Rated at 33000 ppm seawater and 25 °C, salt rejection 99.2 %51,52,50,37,33,38,39
Current drawVentura 150: 12 V 9 A / 24 V 4.5 A, 4.5 W/l (17 W/gal) · Ventura 200T: 12 V 10 A / 24 V 5 A, 4 W/l (14.5 W/gal) · Cape Horn 330: 12 V 19 A / 24 V 10 A (half on one pump), 4.2 W/l · Catalina 340: 12 V 20 A / 24 V 10 A / 48 V 5 A (48 V on the 340C), 4 W/l · Catalina 300 MKII: 12 V about 15 A (max. 16) / 24 V about 7 A · Newport 400C: 12 V 26 A / 24 V 13 A / 48 V 7.5 A, 4.8 W/l · Newport 700C: 24 V 24 A / 48 V 12 A / 110 V AC 9 A / 220 V AC 4.5 A51,52,50,37,33,38,39
Feed pressureShurflo pressure switch (Ventura, Cape Horn) cuts out at 125 psi. Normal feed pressure in a flow test: Ventura 150 60–70 psi (4.2–5 bar) · Ventura 200 and Cape Horn on one pump 80–90 psi (5.6–6.3 bar) · Cape Horn on both pumps and Catalina 340 90–100 psi (6.3–7 bar) · Catalina 300 MKII 80–90 psi · Newport 400 90–110 psi in high mode · Newport 700 about 180 psi (12.6 bar), Newport 1000 about 200 psi53,6,33
Operating temperatureFeed water 2–37 °C (36–110 °F); the Ventura 200T is designed for water above 10 °C (50 °F). Install the unit in a dry, ventilated space below 37 °C37,52
WeightVentura 150D 27.2–27.7 kg, 150R 29.4 kg, 150C 34 kg · Ventura 200T 27.7 kg · Cape Horn 330 38.5 kg, 330R 43 kg, Compact 40 kg · Catalina 340 50 kg · Newport 400C 50 kg (DC) · Newport 700C 80 kg DC, 76 kg AC51,52,50,37,38,39
DimensionsVentura: Clark Pump and membrane module 69 × 24 cm, 30 cm deep; feed pump module 38 × 32 × 11 cm51
Flush waterFrom the boat’s pressure water through the charcoal filter: about 5.5–6 l/min (1.5 US gal/min) at 1.7–2 bar (25–30 psi)7
Years builtCurrent generations of Ventura, Cape Horn Xtreme, Catalina 300 and Newport 400/700 since 2006; Catalina 340 since 2015; Connect (C) versions since 2018; Remote (R) versions since 2021, Cape Horn 330R since 2022. All four lines still in production49

Good to know

  • Order Clark Pump kits by pump size, not just by model name: the Ventura 150 has the 7 % pump; the Ventura 200, Cape Horn, Catalina and Newport 400 the 10 %; the Newport 700 and 1000 the 20 %. Seal and offshore kits are shared by the 7 % and 10 % pumps, the full rebuild kits are not.2
  • A flow test shows where the fault is: compare product flow with total flow. If the recovery is below 5.5 % (7 % pump), 8 % (10 %) or 17.5 % (20 %) with a clean membrane, the Clark Pump needs seals or a rebuild; if pressure and flow are right but the water is salty, suspect the membrane.2
  • Chlorine kills the membrane – Spectra’s tolerance is 0 ppm. Never run or flush with dock water unless it passes a proper charcoal element, and change that element on time; cheap look-alike carbon filters may take out far less chlorine or not seal in the housing.6,37
  • Never pickle a Spectra with sodium metabisulfite, citric acid or other makers’ storage chemicals: they are acidic and attack the Clark Pump. Use SC-1, or food-grade propylene glycol of at least 60 % – never automotive antifreeze – and open the Clark Pump pressure relief valve half a turn before any chemical goes through.6
  • Low output is often low voltage, not wear: on a 12 V Ventura, half a volt lost at the pump costs about half a US gallon per hour. Test at 13.2 V or more and check the wire size before buying parts.6
  • Bought a boat with an old or neglected Spectra? Fit new prefilters, rinse 4–6 hours with the relief valve open, clean with SC-2 if the brine smells, then pressurise and compare with the nominal figures. Typical replacements are the membrane, the feed pump head and the Clark Pump seals; keep a rebuild kit aboard if the pump has not been serviced for five years.54

Fitted in

Boats whose builder lists it as standard or optional equipment:

  • Catana 47 — Spectra 60 l/h · 12 V (47 Ocean Class (A-2006): standard, with taster tap, distribution valve and remote control at the galley; model not named)

On the marketplace

Looking for a part for Spectra watermakers? Post a wanted ad in the app — it is free, it sits on the live map, and boaters nearby who have the part aboard can answer.

Got spares you no longer need? List them in a minute. No commission, ever.

Get the app

Sources

  1. spectrawatermakers.com/products/clark-pump-seal-and-o-ring-kit-7-10-kit-s-o
  2. support.katadyngroup.com/scripts/file.php?view=Y&file=zncp8774fl8jx9dxr106mz4m4s5otiop
  3. support.katadyngroup.com/scripts/file.php?view=Y&file=qbrpbbhukoqzcxdhb0as2cmy3s3hpvdi
  4. spectrawatermakers.com/products/clark-pump-seal-and-o-ring-kit-20-kit-s-oh
  5. spectrawatermakers.com/products/offshore-kit-7-10-clark-pump-kit-offsh
  6. spectrawatermakers.com/cdn/shop/files/MAN_Ventura_150-200T_Deluxe_6.6.2025_1.pdf
  7. spectrawatermakers.com/cdn/shop/files/MAN_Newport_400C_12v-24v-48v_5.27.2025_1.pdf
  8. spectrawatermakers.com/products/offshore-kit-20-clark-pump-kit-offsh1
  9. spectrawatermakers.com/cdn/shop/files/MAN_Newport_700c-1000c_24V_48V_110V_220V_5.8.2025_1…
  10. spectrawatermakers.com/products/clark-pump-distributor-rebuild-kit-7-kit-hp-7ud
  11. spectrawatermakers.com/products/clark-pump-distributor-rebuild-kit-10-kit-hp-10ud
  12. spectrawatermakers.com/products/clark-pump-distributor-rebuild-kit-20-kit-hp-20ud
  13. spectrawatermakers.com/products/shurflo-pump-head-pl-pmp-sfph
  14. spectrawatermakers.com/cdn/shop/files/MAN_Cape_Horn_Extreme_330_3.7.2025_1.pdf
  15. support.katadyngroup.com/scripts/file.php?view=Y&file=izyx8uu0lid2cp7ol9jrx773h1454cmx
  16. spectrawatermakers.com/products/shurflo-feed-pump-12v-dc-pump-only-el-fp-12v
  17. spectrawatermakers.com/products/shurflo-feed-pump-24v-dc-pump-only-el-fp-24v
  18. spectrawatermakers.com/products/shurflo-feed-pump-fan-cooling-kit-12v-kit-fk-12
  19. spectrawatermakers.com/products/shurflo-feed-pump-fan-cooling-kit-24v-kit-fk-24
  20. spectrawatermakers.com/products/shurflo-feed-pump-diaphram-drive-kit-el-fp-dp
  21. spectrawatermakers.com/cdn/shop/files/MAN_Cape_Horn_Extreme_330R_5.23.2025_1.pdf
  22. spectrawatermakers.com/products/mag-vane-feed-pump-140-140-psi-pl-pmp-140mag
  23. spectrawatermakers.com/cdn/shop/files/MAN_Catalina_340C_12v-24v-48v_10.14..2025_1.pdf
  24. spectrawatermakers.com/products/mag5-drive-vane-pump-240-250-psi-pl-pmp-240mag5
  25. spectrawatermakers.com/products/centrifugal-laing-boost-pump-marine-el-fp-bpldc824
  26. spectrawatermakers.com/products/centrifugal-laing-boost-pump-impeller-el-fp-bpldc824im
  27. spectrawatermakers.com/products/5-micron-filter-element-ft-ftc-5
  28. spectrawatermakers.com/products/oil-water-separator-filter-element-ft-ftc-ow
  29. spectrawatermakers.com/products/20-micron-filter-element-ft-ftc-20
  30. spectrawatermakers.com/cdn/shop/files/MAN_Ventura_150_-_200T_Connect_5.27.2025_1.pdf
  31. spectrawatermakers.com/cdn/shop/files/FACT_Spectra_Ventura_150C_250716_EN.pdf
  32. spectrawatermakers.com/products/carbon-filter-element-ft-ftc-cc
  33. support.katadyngroup.com/scripts/file.php?view=Y&file=1qdjucbjfqvggbwi8awamnbgwpmgt02f
  34. spectrawatermakers.com/cdn/shop/files/MAN_Catalina_340R_5.23.2025_1.pdf
  35. spectrawatermakers.com/products/2-5x20-replacement-membrane-kit-kit-mb-20f
  36. spectrawatermakers.com/products/2-5x40-replacement-membrane-kit-kit-mb-40f
  37. spectrawatermakers.com/cdn/shop/files/FACT_Spectra_Catalina_340C_260121_EN.pdf
  38. spectrawatermakers.com/cdn/shop/files/FACT_Spectra_Newport_400C_260121_EN.pdf
  39. spectrawatermakers.com/cdn/shop/files/FACT_Spectra_Newport_700C_250716_EN.pdf
  40. spectrawatermakers.com/products/salinity-probe-el-mpc-sp4
  41. spectrawatermakers.com/cdn/shop/files/MAN_Ventura_150-200_Remote_Manual_6.6.2025_1.pdf
  42. spectrawatermakers.com/products/handheld-salinity-meter-kit-hhm
  43. spectrawatermakers.com/products/ventura-200t-vt-200-t-12
  44. spectrawatermakers.com/products/sc-1-storage-chemical-kit-chem-sc1
  45. spectrawatermakers.com/products/sc-2-alkaline-cleaning-chemical-kit-chem-sc2
  46. spectrawatermakers.com/products/sc-3-acid-cleaning-chemical-kit-chem-sc3
  47. spectrawatermakers.com/products/basic-cruise-kit-a-kit-bck-a
  48. spectrawatermakers.com/products/basic-cruise-kit-b-kit-bck-b
  49. support.katadyngroup.com/672150-Spectra-Watermakers-Manuals
  50. spectrawatermakers.com/cdn/shop/files/FACT_Spectra_Cape_Horn_330_260121_EN.pdf
  51. spectrawatermakers.com/cdn/shop/files/FACT_Spectra_Ventura_150D_250716_EN.pdf
  52. spectrawatermakers.com/cdn/shop/files/FACT_Spectra_Ventura_200T_250716_EN.pdf
  53. support.katadyngroup.com/110134-Quick-Production-Breakdowns-of-Systems
  54. support.katadyngroup.com/384765-General-Tips-for-Inherited-or-Neglected-Systems

Spectra Watermakers is a trademark of its owner; boatparts.app is not affiliated with it. Part numbers are quoted for identification only. Spotted an error? Write to mail@boatparts.app.