[Marcin Chyla]

Hello, ok I explain my way of thinking… In RO filter we have two ” boxes” wich are separate by membrane – in one “box” we have tap water and in second we have pure water. When pressure in tap water “box” is high – water molecule can go thru the membrane to the second box with pure water. If we do more pressure in tap water box – more water molecule can go thru the membrane. We often put special end to outer pipe from tap water “box” – to increase pressure in that box – it is good.
Becouse of my long pipe from filter and becouse of high level of my aqua ( 1.5 m higher then RO filter ) ,I increase pressure in pure water “box” and the same time pressure between this two boxes is going down. Then water molecule can’t go easy from one box to second and productivity of RO fiilter is going down. That’s why conductivity of my water was so high. If someone of You have high pressure in his/her tap water instalation, then, the long pipe from pure water box in RO filter in not able to decrease pressure in filter – I have a low pressure and that’s why my RO fiilter pressure decrease so easy… I hope that my explaination was clear 🙂 and readable 🙂 Best regards !