Desalination Systems
SeawaterPro DIY Watermaker
High-output desal at a DIY price
- 8.2/10 How we scored
- $2,500–$4,000 Checked Jun 2026; not a promise
- Cost-focused boaters and off-grid builders
Marketplace prices change often — verify the latest price before buying.
Evidence
| Format | Desalination |
|---|---|
| Listed output / capacity | Up to ~30 GPH |
| Install | Not listed by seller |
| Seller-listed certification | None listed by seller |
| Replacement interval | Not listed by seller |
| Price band | $1,500 – $5,000 (seller's listed price: $2,500–$4,000) |
| What we did not test | HU did not lab-test this unit. No contaminant-reduction, output, or durability result on this page is an HU measurement. |
Our review
SeawaterPro has built a following among cruisers by offering high-output desalination at prices well below traditional marine brands, using standard, serviceable RO components you can maintain yourself.
It asks a bit more of the owner in setup and upkeep, and it needs AC power, but the value-per-gallon is excellent for boaters and off-grid builders comfortable with some hands-on work.
Pros
- High output for the price
- Standard, serviceable components
- Popular in the cruising community
Limits
- More owner setup and maintenance
- AC power required
The HU recommendation
Best value for high-output desal if you're comfortable maintaining your own gear. Pair with adequate generator or shore power.
Accessories
Bottle & accessory
HM Digital TDS-EZ Water Tester8.5/10 HU score · ~$15 listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
- Universal 10" Sediment Pre-Filter (6-Pack)
Replacement filter
Universal 10" Sediment Pre-Filter (6-Pack)8.3/10 HU score · ~$25 (6-pack) listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
- Spout Always Fresh Pitcher
Bottle & accessory
Spout Always Fresh Pitcher9/10 HU score · $99 listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
Compare this
Compare all three in a table- SeawaterPro DIY Watermaker
- Katadyn Survivor 35 Desalinator
Desalination
Katadyn Survivor 35 Desalinator8.7/10 HU score · $2,000–$2,600 listed
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
- Rainman Watermaker
Sources
- SeawaterPro manufacturer documentation · specifications as listed by the seller; HU did not independently verify
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