ro units can indeed waste a tremendous amount of water, it all depends on your water pressure and water quality. you can increase efficiency by adding a booster pump and or a permeate pump. or by pretreatment of the water. ... tho most find the added expense not worth the rewards. pretreatment can also be used to extend the life of the cartridges.
industrial scale RO process use pressures are astonishingly high, up too 1000psi if i remember.
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im curious as to why you need the ro water tho. is your tap super bad... or are you running a hydro setup?
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i have what i would consider bad water... 300mg/l combined carbonates. i had to adjust my old ro based hydro fert schedule to account for the terrible tendency of my water to scale out carbonate when i dose up the regular amount of calcium nitrate.
i ended up using about 2/3'rds... replacing the rest with potassium nitrate and dropping some of the epsom salt too. i also had to drop the ph to like 5.5, but acid is oh-so cheap... Â
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even tho you already bought the ro unit, you might be able to do the same or something similar.