[Lee.]

I have a friend who wants to use wfp in oxford and I want to advise him on the best system to get. I just need to know what the TDS of the water in Oxford is. Can anyone help me please?

Lee

[freshwater]

Oxford is in the thames water catchment area, I know the water is hard down there becase we sell quite a few water softener to that area. your best bet is to call 0845 9200 800 and ask thier help line.

steve@freshwatersystems.co.uk

[cybersye]

is water softner a filter i can add to my ro? got a tds of 380 in on a ro man 450 gpd, product out is 40 ppm before di ( pressure 75 psi) , does this sound right? i thought the product would have a lower tds than that
Simon

[freshwater]

cybersye,

40s not bad, about a 90% reduction. I don’t know what restrictors RO man use on the 450GPD it may be these are bit off, we us a needle valve on ours so the drain can be adjusted to exactly match your input pressure. On our 400GPD 4-pump system running at 70psi and hard water we get 6-7ppm on water of 320ppm. A softener won't necessarily reduce your TDS but it will make your membranes last longer.

steve@freshwatersystems.co.uk

[JM123]

380 down to 40??  75Psi pressure!!

We get 5ppm from our merlin setup, tap pressure only 48psi and tap tds today was 340ppm (fluctuates between 300 and 350).  Plus we are still getting a product rate of 1.8lpm.

I wouldn't be happy with 40ppm - no way - I'd suspect freshwater is right and say that the flow restrictor in the waste pipe is not the correct bore or length for the membranes.