Watermaker Membranes - SailNet Community
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post #1 of 5 Old 09-13-2012 Thread Starter
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Watermaker Membranes

I bought a used watermaker on CF cheap, a System 9. It certainly will need new membranes, even if they were pickled, after 8 years of disuse. Is there any competition for the Dow Filmtec SW30-2540? It's the only 2.5" X 40" saltwater membrane that I've found. American RO seems to have the best price at $180.00 each, have you seen any better prices?

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post #2 of 5 Old 09-13-2012
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Re: Watermaker Membranes

$175-180 is a typical 'good' price for a 2.5X40 SW membrane.

My usual supplier for SW membranes is: Midwest RO Reverse Osmosis and Water Filters and Membranes in Illinois

Dow Filmtec is the worlds largest manufacturer of spiral wound RO membranes. There are cheapy asian membranes but their history is of great variability of the retention, etc. Hollow fiber bundled RO system 'membranes' are another possibility but much greater in $$ than the Filmtec.

Go to the filmtec website and download: "RO membrane regeneration and restoration", if you have that level technical/chemical ability and a good TDS meter to verify your 'regen'. Depending on the actual membrane, you may have to 're-start' them using glycerine to accomplish the 'wet out' if they are polysulfone (non-filmtec) instead of polyamide.
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post #3 of 5 Old 06-18-2013
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Re: Watermaker Membranes

Dow has some low pressure membranes, 100 psig, that are speced to remove 99% of the salt when the temp is 77F and the salt content is 500 ppm. Ocean water is 32000
ppm. Would the membrane be damaged if it is exposed to feed water that contains more than 500 ppm of salt? Is it possible to put two of these low pressure membranes in series to make drinkable water?

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post #4 of 5 Old 06-19-2013
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Re: Watermaker Membranes

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Originally Posted by Captainmeme View Post
Dow has some low pressure membranes, 100 psig, that are speced to remove 99% of the salt when the temp is 77F and the salt content is 500 ppm. Ocean water is 32000
ppm. Would the membrane be damaged if it is exposed to feed water that contains more than 500 ppm of salt? Is it possible to put two of these low pressure membranes in series to make drinkable water?
The membrane wouldn't be damaged but the product will be salty. Those are I believe the membranes for home use to purify tap water, not for producing fresh drinking water from salt. 2 in series will still give salty product.

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post #5 of 5 Old 06-19-2013
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Re: Watermaker Membranes

I just put new membranes in my katadyn power survivor 80e 2 membranes total $700 expensive but the ppm is now 120 to 128ppm. The ones I replaces started to fail quite quick, one month of use went from 580ppm to 920ppm when I pulled them they were deformed and well down on their diameter compaired to the new ones. not bad for 6 years continuous daily use.(2-3 hours) and never pickled.

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