Membrane Solutions 150 GPD Reverse Osmosis Membrane, NSF/ANSI 58 Certified | 12"x2" RO Membrane Replacement For Under sink Water Purifier, Aquarium Reef and Maple Syrup DIY RO System, 2 Pack

Have used for maple sap processing for the past four years. Operating at 90 psi will remove 2/3 of the water. Hobby level producer with under 100 taps.

I made a RO unit for maple sap using the Hydrologic Stealth 300 and it took the sap from 2.1% to 3% sugar with one pass. I replaced the membranes from a local store to get me started this past spring at $80 a pop! Since we doubled the number of taps we needed to increase the efficiency of the RO unit and I added 5 pairs of 150 membranes and housing to the unit in series and now can take the sap in one pass from 2.5% to 4.5% sugar. But the real difference is in the "pure" water which isn't as we learned last year when my wife used it in the iron (yes it was a mess). The Stealth 150s let 0.50% sugar through where these units let only 0.15% which for us means less sugar wasted and more syrup (about 3 gallons more per 1000 gallons of sap)! This also means the water is more pure than before, and at 1/4 the cost.

It's been seven years, and the membrane is still working great. We have 170 ppm in the pipelines, and 3 ppm at the filter outlet. I had to add a booster pump because the pipelines are at 40-45 psi. This membrane works best at 90 psi, where I achieve 3 ppm.

Great filters. High flow rate, very good quality. Wish they make them in a 3 pack.

They only last about 3 months then the water flow slows significantly. Although they are much cheaper than the hydro-logic 300 RO replacements. I’ve used both and the life on them are exactly the same. This garbage that the water is dirty and that’s the reason of its short life is simply not true. The manufacturers on both membranes replacement systems just like overselling there products. If there is truly a Warrenty for there life, I would challenge all of it!

270ppm input water with 3 pre filters before and they went from producing 480ml per minute at 80psi and 75 degree water down to 230ml per minute in less then 108 gallons of RO. Maybe i got defective membranes or maybe theyre junk either way Not good. Hopefully the company will stand behind theyre product and water production claim and i will update review with results. So far not a good start. The actual hydrologic membranes lasted over 8000 gallons before theyre was even a slight 6% reduction in production volume.

Good deal.

I didn’t realize how old my RO filters were. Checked the TDS at around 100 after filtration and ~325 before. I thought this was fine. Got an ad for these replacements and thought it was probably time to do it but I didn’t expect a change. I was wrong - TDS between 8-12 after the swap and the flow rate was noticeably faster.