[Sean Dyer]

Is it worth using a booster pump if you are di only , as my tap isnt that fast and 500 l probably takes best part of half hour, would a booster fill it alot quicker?

And when the valve shuts off at full would the booster pump stop??

[Lee GLS]

i dont know how the pumps work with di only, but you would need a pump with a pressure sensor to cut the pump off when the valve shuts,

[craig21t]

Is it worth using a booster pump if you are di only , as my tap isnt that fast and 500 l probably takes best part of half hour, would a booster fill it alot quicker?

And when the valve shuts off at full would the booster pump stop??

Di resin needs a certain amount of contact time with the water, so you do not want to pump it through.

[Hedgehog]

I got myself a booster pump for my 4040 as I am moving soon and will need one, but I decided to rig it up today to test it.

My tap psi is 80 but after the pre filters the pressure guage says 40, and it takes about 3-4 hours to make 500l.

Put the pump on and the pressure guage after prefilters was reading 85 psi, and it only to 1h 20mins to make 500l.

The tap tds is 375 and now it comes out of the ro at 8ppm.

Altogether a happy chappy 

Hi Lee,


Where did you get your 40-40 ro system from. I am looking to get a  RO system and keep getting conflicting advice. Not sure whether to get a 40-40 or a 450gpd system. I get advice that a 450gpd system would be best as the waste to pure ratio is better and it produces a better tds reading at output and then I get told that they take ages to produce water...geting very confused!Maybe a 40-40 is better?

[Lee GLS]

hedgehog, my 4040 system was part of the van mount that i got from the cleaning warehouse.

I havnt had a 450gdp system so i cant comment on what they are like.

when i was looking for a system, the info that i found was that the 4040 produce less waste than other ro's. I also caan imagine that a 450gpd would get the tds any lower than a 4040, after all my tds is high (375), and after the ro it brings it down to 10 without a booster pump, or 6 with the booster pump.

my 4040 takes 3-4 hours to produce 600L without a booster pump and today it make 600L in 1.5 hours, but either way the 450gdp will take alot longer than that.

Really it all comes down to money, and how quick you need to produce the water, i got the 4040 as i had nowhere to have a static system so i needed to be able to produce the water quickly.

If you have a static system, then the 450 would be fine, but i have been well impressed with my 4040 but they are £££

[Hedgehog]

hedgehog, my 4040 system was part of the van mount that i got from the cleaning warehouse.

I havnt had a 450gdp system so i cant comment on what they are like.

when i was looking for a system, the info that i found was that the 4040 produce less waste than other ro's. I also caan imagine that a 450gpd would get the tds any lower than a 4040, after all my tds is high (375), and after the ro it brings it down to 10 without a booster pump, or 6 with the booster pump.

my 4040 takes 3-4 hours to produce 600L without a booster pump and today it make 600L in 1.5 hours, but either way the 450gdp will take alot longer than that.

Really it all comes down to money, and how quick you need to produce the water, i got the 4040 as i had nowhere to have a static system so i needed to be able to produce the water quickly.

If you have a static system, then the 450 would be fine, but i have been well impressed with my 4040 but they are £££

Cheers,

Is this the sort of thing you have     http://www.gapswater.co.uk/acatalog/copy_of_Reverse_osmosis_kits.html   

[Lee GLS]

yeah, mine has the 20" prefilters.

[Hedgehog]

Ok cool......So even without a pump you were getting good results

[Hedgehog]

Lee,  Do you know approx what the waste to pure ratio is? 

[Lee GLS]

to get the optimum tds, without the pump it was 30/70, but that can be reduced by shutting the waste tap more, but that increases the tds. i will have to see ifs its any different with the pump.

Are you on a water meter?

[Hedgehog]

to get the optimum tds, without the pump it was 30/70, but that can be reduced by shutting the waste tap more, but that increases the tds. i will have to see ifs its any different with the pump.

Are you on a water meter?

Yep..

So for ever 100litres  30 would be pure and 70 waste 

[Lee GLS]

right i have just done a quick test.

To make 1/2ltr (500ml) pure it produce 600ml waste, so that is 45/55 pure/waste ratio, that is with the booster pump, and the waste tap open slightly. do with the tap shut, im sure it would be 50/50 if not better and the tds would be 9.

[Hedgehog]

right i have just done a quick test.

To make 1/2ltr (500ml) pure it produce 600ml waste, so that is 45/55 pure/waste ratio, that is with the booster pump, and the waste tap open slightly. do with the tap shut, im sure it would be 50/50 if not better and the tds would be 9.

Top man..Thanks for all that.  Back to my original plan then of a 40-40...Cheers   

[Lee GLS]

no problemo 

[Hedgehog]

no problemo 

Hi Lee,


Got my 4040 from Gaps today. Set it up. Sorted out a few leaks and very happy so far.

Early days but 50-60psi. 450 tds in ( didnt realise it had gone so high) output 30, then 22 now 17 tds. Approx 2 litres a minute pure at 1:2 max ratio.

Will play around with it a little more over the weekend.

Does it matter if the RO Membrane is positioned vertical or horizontal?

Cheers for your help. 

[Lee GLS]

No I don't think it does matter, but if you have it vertically I would have the waste tap at the top, those figures sound good as you have a tds.

Also as they are new membranes they will probably need flushing for an hour or so.

[Hedgehog]

No I don't think it does matter, but if you have it vertically I would have the waste tap at the top, those figures sound good as you have a tds.

Also as they are new membranes they will probably need flushing for an hour or so.

ok cheers.

my tds has gone really high... was 350 in the winter.

Happy with speed of water production and hopefully output tds will drop a little more.