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booster pump and pressure valve thingy help required


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hi guys, many of you may have seen my thread about rejigging my ro system to provide virtually 0 ppm if poss, well just put a few things in this morning and started to tinker with things, came across a few things i need help with.

1,  recommendations for a low energy booster pump for my 40/40..preferably 12v if poss

2, on my old system i used to use the waste valve to regulate the pressure, work great with a good 50/50 waste/pure split. is there another way? valve etc


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