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Old 07-25-2009, 02:19 AM   #29
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Originally Posted by Tellie View Post
Thanks Trim.

I went to the hydra cell site. I have a lot of reading to do. Very very interesting. I see they also are into RO units. I gather at a glance that they do only large units. Would the F20X be easy to rebuild for the average handy boater guy?
Easier than most...but not simple. There is only one piston which makes for fewer seals.

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Old 01-16-2010, 01:28 AM   #30
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Originally Posted by Trim50 View Post
This is very interesting, because I have a very real third option close at hand which would be an engine driven unit. The reason this option make sense for me is that I removed an engine driven refrigeration compressor and I still have the sturdy compressor mount and two belt pulley installed. I also already have the dedicated thru-hulls installed. I could very easily buy a CAT pump, a clutch and install them in one weekend.
If you have not already done your watermaker, http://www.rutuonline.com/html/watermaker.html is a very interesting and practical approach with the parts, etc....

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Old 09-04-2012, 09:17 PM   #31
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Originally Posted by Trim50 View Post
My product output is between 20-25gph at 800psi using 50-56amps/12V...about what I expected.
Hello Trim,

I just ran across this thread and I'm wondering if there is a typo above.

According to Hydra Cell the F20X pump will deliver just under a gallon per minute or close to 60 gallons an hour. A 20 gallon per hour permeate flow would be a 33% recovery rate. That recovery rate seems quite high and still produce a low TDS.

I am a few days away from pulling the trigger on a F20X pump with a 2540 membrane or an F20E pump with a 2521 membrane. In theory according to Dow's ROSA software, neither combo will work properly. But, there are a number of published cases where an F20E and a 2521 membrane deliver 20% recovery rates with low TDS.

Dow wants at least 1 gallon per minute of concentrate flow out of the 2540 membrane. That concentrate flow can't be reached with a F20X pumping 1 gallon per minute in. How is your 2540 holding up with less than recommended concentrate flow rate?

Any further operational details on your watermaker is appreciated.

Very nice installation, BTW.

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Old 09-05-2012, 04:22 AM   #32
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Here's a couple of DIY watermakers, FYI:

Sail-World.com : DIY

"The cure for anything is salt water... sweat, tears, or the sea" -- Isak Dinesen

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Old 02-10-2018, 10:31 AM   #33
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Default Hydracell Pump?

any new informations about the performance of the Hydracell F20X high pressure pump?
Here again what "Trim50" claimed:
So here it is after much talk...12V, 25 gallons/hour draws 52 amps.

In my opinion too good to be true for 1gpm pump!!!

Are there any experiences with DC driven Hydracell pumps in RO systems?

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Old 02-14-2018, 11:04 PM   #34
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I built my own 540 gallon per day watermaker , for around $750.
I used a General TT911 pressure washer pump , engine driven. Works well. My book tells you how to build one. The guy who showed me how, has been using his since the mid 90's, no problems.

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