I recently got all the bits I needed but now it's together I'm struggling with the Ro unit as 9 hours later and my 350 litre tank is only over half full. I've ordered a booster pump tonight out of desperation. I set the tap on the Ro so that water flows from the pure pipe and a very slow dribble comes from the red waste pipe. the pressure from the hose/main tap seems good but the flow from the pure water pipe is so slooow. Imagine turning your tap on indoors and having it on just enough for the water to flow and not drip and that's what I'm getting. does this sound right and will the booster pump help produce the water quicker? Also, how does the booster pump plumb into the Ro?
First of all is to check your pressure from the tap needs to be over 40psi
2nd how many ro's do you have ? and are they 40ins ro's ?
If they are second hand before you buy a new membrane flush out the ro with pure water not from the tap, the best way to do this is connect a hosepipe to your outlet as if you were cleaning windows then connect other end to your fill port open up ro fully anti clockwise switch your pump on full and monitor the flow from your drain port if it is slow and then comes out faster after about 10 to 15 mins then it has being clogged up so continue to flush until a good flow is coming out of drain port and depending on your hardness of water TDS from tap depends how often you need to flush. with a very good inlet pressure you should fill your 350 tank in about 2 hours max. if it is a small ro unit normally used for domestic water then yes it will take a long time to fill a tank.
when you are producing pure water you should regulate your pressure around 10 to 15 psi from maximum depending on type of system shown on the pressure gauge so you have a nice 2 to 3 inch flow from your drain port this should give you best quality water and a quicker fill time,
but it would be nice to know what your system consists of if you cut corners and do not use the right equipment and filters then you will experience problems forever.