[poleman]

this type of membrane works of low water pressure!

does anyone know how low as my tap water is 20psi

[russ_clark]

give june at gapswater a call
very helpful lady
got mine from her
Russ

[poleman]

I tried but annual leave 

[colin purewater]

my tap preasure is 30 psi i have a merlin and it aint workin great
would i be better with a 4040 then?

[GB Window Cleaning]

two words... booster pump!

[colin purewater]

 i nos this but if an ro can work better at low  tap psi
i might be money better spent in the long run GB

this is why we post on here....

[Roy Harding]

I think 60psi is the lowest it will go.

Roy

Ps Also when the water board dropped our pressure from 80psi to 40psi it was useless, so had to buy a booster pump.

[Paul Coleman]

I have a 4040 HF5.  It operates at pressures between about 32 and 40 PSI (depending if anyone else in the complex is using water).  It's not an optimum performance but it's sufficient for me to avoid a booster pump.
From tap TDS of about 200 it gives me a TDS between 008 and 016 at a rate of anything between 65 and 95 litres per hour.  The last time the production dropped, it increased again after changing pre-filters.
20 PSI sounds very low and I haven't had mine that low.

[niceandclean]

I think it is 32 psi? I have a HF5, coming up for 2 years old now!
I have a booster pump, boosts up to 60-65 psi, Tds out 15, in 378!
I also have a HF4 that is about 5 years old, same details as above, but Tds out 9-10!

[Frankybadboy]

my tap preasure is 30 psi i have a merlin and it aint workin great
would i be better with a 4040 then?

merlin are only anygood with high water pressure,add a booster pump will be cheaper than buying a new ro

[poleman]

thanks chaps seems I'm going to need a booster pump!

niceandclean...what booster pump do you use on your HF5 4040 RO

[niceandclean]

This one!

www.ro-man.com/shop/product_info.php?cPath=28&products_id=245

I have one on the HF4, bought it in June 07, never missed a beat, so bought another for the HF5.

 

[Roy Harding]

I got this one pumps at well over 100psi fills 500ltrs in one hour 10 mins.

http://www.ebay.co.uk/itm/CLARKE-ELECTRIC-WATER-PUMP-BOOSTER-230V-48-METRE-HEAD-/110698948682?pt=UK_HomeGarden_Garden_PondsWaterFeatures_UK&hash=item19c62be84a

Roy