[andyralph]

Hi all filled my tank last night 700 litres took 7 hours checked my water pressure 40psi from tap boosted to 100 psi checked my water ratio worked it out 180 litres waste and 60 litres  per hour pure spoke to the cleaning warehouse about altering my gate valve and they said it is set Wright could it it be my membrane it’s 2 years old thanks andy

[Don Kee]

Have you changed your prefilters?

[andyralph]

Hi yes last month I swap them every 2 months

[mac74]

Hi all filled my tank last night 700 litres took 7 hours checked my water pressure 40psi from tap boosted to 100 psi checked my water ratio worked it out 180 litres waste and 60 litres  per hour pure spoke to the cleaning warehouse about altering my gate valve and they said it is set Wright could it it be my membrane it’s 2 years old thanks andy

700L's  in 7hrs = 100L's of pure per hr, Not 60L per hr? It sounds like you are putting to much to waste?
Try adjusting your waste/pure valve, and see what happens.
Ive always been on the understanding that the average norm is that making 1 tank pure also makes 2 tanks of waste, so 33% good and 66% waste ish.

What's your setup, is it a 4040  (40") RO that you are using?

For comparison,
I use 2x20" pre filters, into a 40" RO, into a 7L resin vesel, into the tank.
Water pressure is 40psi, into a 1000w mains booster.
My valves sweet spot is 80psi (boosted) and it makes me 200L per hour of pure, (which means 400L is going down the drain)
My TDS in is 420ppm, and comes out of RO at 12ppm when its new, and after say 20 mths it rises to about 28ppm, and thats when i change the RO, as it is using to much resin. (pre filters every 3 mths)
Hope this helps.
M

[andyralph]

Hi yes a 4040 yes what I should of said I done a quick test 2 night I measured my waste I litre took 20 seconds and pure Water 1 litre took 60 seconds it’s only been last month that as really slowed up and I’ve altered nothing the cleaning warehouse said my membrane is no good yet it’s coming out of membrane at 4 before my resin thanks andy

[NWH]

Must be something wrong I would get 700 litres on that 40psi in that time  with an HF5 unboosted.

[Ched]

Hi yes a 4040 yes what I should of said I done a quick test 2 night I measured my waste I litre took 20 seconds and pure Water 1 litre took 60 seconds it’s only been last month that as really slowed up and I’ve altered nothing the cleaning warehouse said my membrane is no good yet it’s coming out of membrane at 4 before my resin thanks andy

Sounds like the hole in the gate valve has worn bigger so allowing more waste!! You are running at 3:1 waste to pure and that seems a fair bit too much waste. I would say you should be running 60% waste 40% pure.

[andyralph]

Hi yes I agree I’ll alter the valve to 60 40 and c how I get on thanks for advice andy

[Ggh]

Pressure too low and temperature also may affect it.

[Mike Burd]

I had the same issue with a Pure Freedom system & they predrill their gates. I changed membrane, prefilters and pump. It was the gate valve. And tbh, I suspected right from the start it was.

[NWH]

If you put a lever valve on it for the waste you can tighten the screw so you know where to stick it back to after you’ve flushed manually.

[Simon Trapani]

If you put a lever valve on it for the waste you can tighten the screw so you know where to stick it back to after you’ve flushed manually.

I just put a mark on the gate valve. It's my 'sweet spot'.

Gate valves give even greater control.

[andyralph]

Checked water pressure which is fine so ordered a new gate valve did not realise u can’t alter a gate valve as it comes with a predrilled hole thanks andy

[Simon Trapani]

Just buy a gate valve from a plumber’s merchant or online. You don’t need a pre-drilled hole like pure freedom’s. I see the hole as a membrane protection, so you can’t fully shut it.

[andyralph]

Hi all put a pressure gauge on my system and pressure is 65 psi is that good enough thanks andy

[Mike Burd]

Hi all put a pressure gauge on my system and pressure is 65 psi is that good enough thanks andy

Do you mean that’s the water pressure from the tap measured at the tap?

[andyralph]

Hi I’ve put the gauge just before prefilters so from tap into booster and then into fill thanks andy

[Mike Burd]

I misread your OP as the membrane was two months old. What’s the tds from the membrane and what’s the tds from the tap?

65 is not great, but your pure to waste ratio should be about 60:40 so I still suspect the gate unless the output tds indicates the membrane is gone anyway.

[andyralph]

Hi membrane is two and half years old and tds out of membrane is 4 and I produce 6000 litres a week thanks andy

[robert mitchell]

If you put a lever valve on it for the waste you can tighten the screw so you know where to stick it back to after you’ve flushed manually.

I just put a mark on the gate valve. It's my 'sweet spot'.

Gate valves give even greater control.

Better to just use a y piece on the waste and set the gate valve and leave it , use a lever valve on the second line from the y piece to flush .