[Mike Burd]

We’ve noticed a sharp drop in water production. We’ve tap pressure of 40psi which we boosted previously to about 95 with a Clarke’s pump but it’s dropped to 60 causing serious problems. Membrane about 4 months old and produces at 7ppm still but product is down to 95 litres per hour which is terrifyingly slow for 7 vans.

I’ve ordered a new pump and a new membrane for delivery tomorrow but any other ideas?

[windowswashed]

An ibc tank or two or more linked together for 24/7 water production through RO for storage to transfer into vans as and when required.

[Smudger]

just need a new pump - its most likely got wear on the impeller.

just for info I changed my hose from the standard 1/2" to 3/4" bore after the pump - this increased pure production by 10% but it has also (so far) preserved the membrane - its still at 006 from an average of 320 after a year - before it would by now normally be uup to 11 or more ( I produce on average 2000 ltrs a day pure.

HTH

Darran

[Mike Burd]

just need a new pump - its most likely got wear on the impeller.

just for info I changed my hose from the standard 1/2" to 3/4" bore after the pump - this increased pure production by 10% but it has also (so far) preserved the membrane - its still at 006 from an average of 320 after a year - before it would by now normally be uup to 11 or more ( I produce on average 2000 ltrs a day pure.

HTH

Darran

I'm hopeful this will sort it. Water issues worry me until it's fixed.  Re: the hose, that makes sense. When running sweet though we have no trouble at all keeping up production but as it grows further I thing I may need to upgrade a bit.

[Mike Burd]

So we've changed the pump and the prefilters. No improvement. We'll be changing the membrane next but the drop in pressure recorded is before the membrane so unsure it will help.

[NWH]

Put it through a spare pump flat out can’t you.

[Mike Burd]

 An update.

I thought the pressure recorded on the RO (we’ve got a Pre Freedom engineered one) was the actual pressure coming out of the pump so I assumed we’d lost pressure. What I realised when I turned the valve to waste was that the pressure dropped to zero or thereabouts which gave me a lightbulb moment. The issue wasn’t the pressure in at all but the fact that our pre set valve was chucking too much to waste.

We bought a new valve without the Pure Freedom presets and we’re now about 65/35 waste to pure and getting around 250 litres an hour with pressure at 100 psi. We were getting 80 litres an hour so three times more now.

So a new pump, new membrane, new pre filters later, the fault was a £9 part. A good lesson though for me and my ops manager.