after many trials and variations i have now gone down kent clean route, many thanks to kent clean and help from lee cheers.
As far as these clarke pumps go with the tank underneath i was told by june from gaps that these were not good for your membranes as i have gone through a few in a very short period of time, i decided to change things around.
with in 6 months of using one of these pumps i killed my first membrane hf4, reported to june she then told me that these pumps were no good, because the pressure builds up then releases a high flow, (well thats what mine was doing anyway!!). then i ordered a hf5 low pressure membrane, with in 8 months of using this with out a pump this membrane was nackered. (meaning the tds started at 11tds then i couldnt get any better than 60-70tds).
Now i think my problems might of been down to the fact that my pump and ro were about 40ft away from the mains, so using 1/2 inch hose to the system and then again using 1/2 inch hose to the waste. (think i might have been losing even more pressure using this hose)
Today my set up is in my yard and is set up as follows: 22mm polypipe to £10.00 b and q pump, 22mm pipe to pressure gage, 15mm pipe to pre-filters, then double 40/40 ro to di then to holding tanks all with polypipe and push fit fittings. my system now produces a combined tds of 11-12tds before di. I can fill a 1000ltr tank in about 2-3 hours. this is housed with in a few yards of the mains. P.S. 350-400tds going in.
I personally think that using polyfit pipes and connections has to be the only way. (no loss in pressure).
Hope this info helps, as it has cost me a fortune to get right!! TIME WILL TELL.
