Reddit reviews SEAFLO 42-Series Water Pressure Diaphragm Pump w/Variable Flow For Reduced Cycling - 12V, 3.0GPM, 55PSI
We found 1 Reddit comments about SEAFLO 42-Series Water Pressure Diaphragm Pump w/Variable Flow For Reduced Cycling - 12V, 3.0GPM, 55PSI. Here are the top ones, ranked by their Reddit score.
UL 778 & CSA 22.2 Certified12 Volt, 3.0 GPM, 55 PSI Positive Displacement PumpVariable Flow With Bypass Technology For Reduced Cycling!Self-Priming And Capable Of Run Dry Operation4 Year Warranty comes standard on all SEAFLO products
Are you mechanically inclined? I built one pretty easily that will remove ~150 gallons/hour of water. At high pressure(200 psi), it'll produce high brix output right off the bat, but the better option is to run at lower pressure(150 psi) and recycle the concentrate back into your source tank until you get an output of 8-10 brix. This reduces the load on the membrane, and reduces the post-flush to release the retained sugar from the membrane. Here's what I used, you'll need to fill in the details (pre-filters, connectors, etc):
Low pressure feeder pump:Seaflo 42 Series. Edit: This pump runs at high enough pressure to cycle through both sides of the membrane without engaging the high pressure pump, which is critical for cleaning and maintenance. After the season, you'll want to run a lye cycle for cleaning, and sodium metabisulfite cycle for storage (spoiler: easier than it sounds: Filmtec Maintenance)
High Pressure Pump: Find a carbonator pump on ebay. You should be able to find a motor and pump for under $150, it might come with an accumulator tank you can ditch. "Carbonator pump" is a good query for the whole setup, "Procon" is good for the vane pump itself if you have a motor. Here's one that's live right now: McCann cabonator
Membrane: Dow Filmtec XLE
Membrane Housing: Membrane Housing
You'll need a pressure gauge and a valve on the concentrate side as well. I initially went with a needle valve, but a ball valve will work just fine for the resolution needed. I mounted all of this stuff onto a harbor freight dolly with a few flow meters into a pretty clean package.
I can provide more details if needed, but some basic plumbing, fabrication, and electrical skills are required (Can you tape NPT joints? Can you provide DC power for the low pressure pump? If not figure it out, then come back and save a few grand over a pre-built solution. If you're not DYI inclined, the pre-built is probably the way to go).