[pingu]

So Matt would that pump be fine for a 4040 system?

Cheers
Dave.

[Clive McDonald]

This one i know.

no because it has the same thin little pipes as a 300gpd (the red and blue ones), my good pump had hoselock on that were converted down.

So while the pressure might be okay, the flow wouldn't.

But i already mentioned, if you had one you wouldn't need a booster. Thats what i foound so surprising and made me feel a mug for the last two years. If you notice the other guys have been saying we told you so.

[Oakley Windows]

This is the one for a 4040 Dave http://www.ro-man.com/shop/product_info.php/cPath/28/products_id/245

[windowwashers]

So really a 4040 is just the name or type of membrane. Looking at Gaps website they say "Production will vary according to water pressure and temperature (typical production rates are from 80 to 200 litres per hour). Typical rejection is 98%."

So this would seem to be an ideal solution to stop having loads of water sta around in storage and taking up room.

Question:

Do you really need a 8litre ++++ vessel for resin or could I just keep my 750ml one that came with my 100gpd system...?

you could keep the one you have you just would be changing it often, i have 2 18l vessels as it saves on resin and also I dont have to mess about with it very often, when I get a place for business I will go to 25l vessals x 3 will save time in the long run.

you can pick up second hand vessals cheap enough

[Oakley Windows]

Those 700ml vessels to be honest are total pants IMO, not worth th eplastic theyre made from. Invest in at least a couple of 7 litre ones off e-bay; the resin usage THEN is much more efficient and cost-effective.

Matt

[geefree]

have used 300 gpd ro-man..... for two years.. set up in the van..... fills 650 litre tank up over night.... connected to standad hose pipe...... comes out at 000...

never had any problems apart from it running a little slow when filters need changing....

lucky though my tap water is around 100tds...so no need for a pump.

dont want water tanks everywhere or resin to buy.... have a 10" di vessel.... never once had to put it on.... am i lucky  .

[windowwashers]

have used 300 gpd ro-man..... for two years.. set up in the van..... fills 650 litre tank up over night.... connected to standad hose pipe...... comes out at 000...

never had any problems apart from it running a little slow when filters need changing....

lucky though my tap water is around 100tds...so no need for a pump.

dont want water tanks everywhere or resin to buy.... have a 10" di vessel.... never once had to put it on.... am i lucky  .

yes you are very very very very lucky Gazza 
I wish I had that

[Andrew McCann]

Bo to hijack but it's really good to see you back and active on here Ian

Dave..  A very worthwhile call or email to June at Gapswater  << google that will get you all the answers you need. You won't get pressured to buy and you will get probably the best informed advice available anywhere regarding the larger RO systems for window cleaners.

That membrane you mentioned should do away with the need for a booster pump unless you have really low water pressure.

In simple terms a 40 inch RO system works exactly the same way as your 300 gpd but in much larger scale.

Andrew

[windowwashers]

Bo to hijack but it's really good to see you back and active on here Ian

Dave..  A very worthwhile call or email to June at Gapswater  << google that will get you all the answers you need. You won't get pressured to buy and you will get probably the best informed advice available anywhere regarding the larger RO systems for window cleaners.

That membrane you mentioned should do away with the need for a booster pump unless you have really low water pressure.

In simple terms a 40 inch RO system works exactly the same way as your 300 gpd but in much larger scale.

Andrew

Cheers Andrew  , back to helping and moving forward now. Tis not often i take my eye off the ball for this long so to speak,

[pingu]

Thanks again to all for your info and esp nice to see you back hear Andrew...

Dave.

[pingu]

So at the moment....my 300gpd unit turn 275 tds into 001, then it goes through a small di vessel and magic.....it is 000ppm tds...so in theory a h5-4040 will have an output about the same then?...so if that is the case I should not need to buy additional di vessels as the current one I have should be man enough to remove 001ppm....

Cheers
Dave.

[matt]

Question:

Do you really need a 8litre ++++ vessel for resin or could I just keep my 750ml one that came with my 100gpd system...?

you can use your existing vessel ( 750 ml ) it will just need changing more often as the amount of water you run though it will of course increase

[ftp]

Would it? Is he going to make more water or just make it faster? (can't be bothered to read the whole post) 

[Andrew McCann]

So at the moment....my 300gpd unit turn 275 tds into 001, then it goes through a small di vessel and magic.....it is 000ppm tds...so in theory a h5-4040 will have an output about the same then?...so if that is the case I should not need to buy additional di vessels as the current one I have should be man enough to remove 001ppm....

Cheers
Dave.

No sorry it won't be big enough Dave.

The 40 inch system produces FAR more water than your 300 GPD. The flow rate would be too much for that DI to have time to remove TDS completely.

You would need one of the larger DI vessels. The benefit for you is that you will hardly ever need to refill it.

Andrew

[Oakley Windows]

Andrew what would you say is the maximum operating pressure for a 300 gpd RO Man system? Is over 100psi okay or would you say thats the max?

Also does flushing at higher pressure give a more thorough flush?

Matt

[pingu]

Okey dokey pig in a pokey...I have written to GAPS as per you suggestion and I am sure they will get back to me in the near future.

So what would the best size be..given that my normal usage per day would be around 325 litres per day...

Thanks

Dave.

[Andrew McCann]

Andrew what would you say is the maximum operating pressure for a 300 gpd RO Man system? Is over 100psi okay or would you say thats the max?

Also does flushing at higher pressure give a more thorough flush?

Matt

125 PSI is the max recommended operating pressure. 100 is more than enough for it to operate at max efficiency.

Yeah I suppose flushing at high pressure is a bit better but it won't really make much of a difference.

Andrew

[Andrew McCann]

Okey dokey pig in a pokey...I have written to GAPS as per you suggestion and I am sure they will get back to me in the near future.

So what would the best size be..given that my normal usage per day would be around 325 litres per day...

Thanks

Dave.

A 30.. ish inch would be great Dave... it takes around a full bag of resin so you would probably only have to refill it every year or two 

BTW they are a bit of a pain to empty and refill.

A good source for resin and vessels is DA Services. Doug is a member here and many buy from him. He does good size vessels which take about half a bag of resin.   


You can get a link to his site from my site.

Andrew

[pingu]

Hi all...I have written to those loverly peeps at GAPS and asked a load of geeky questions about the H4-4040 & H5-4040 Membrane r/o systems and this is what came back...please remember that this information is all approximate.


--------------------------------------------------------------------------------------------------
It is very easy to give figures for small domestic RO membranes as they were designed to work at tap pressure and therefore have lots of facts and figures provided by the manufacturers for different pressures and temperatures - the larger 4" x 40" membranes however are not really designed to work without a pump although the window cleaning profession have been doing just that for over a decade so the information given by the manufacturers is limited, even using computer models it is assumed you are designing a pumped system so it is difficult to work backwards, fortunately I'm dab hand at extrapolating data so do have some figures to give you a ball park idea of what you can expect.

With a HF4-4040 at 250 ppm NaCl water at 50 psi and 20C you can expect to get around 160 litres per hour, at 16C this drops to about 140 litres per hour and at 10C this drop to 130 litres per hour.   The HF5-4040 will produce at least 30% more.

Rejection at 50 psi will be about 93 - 95% so you can expect a tds of about 12 to 20 ppm depending on water chemistry and individual membrane performance.
------------------------------------------------------------------------------------------------------

Cheers
Dave.

[Oakley Windows]

Andrew what would you say is the maximum operating pressure for a 300 gpd RO Man system? Is over 100psi okay or would you say thats the max?

Also does flushing at higher pressure give a more thorough flush?

Matt

125 PSI is the max recommended operating pressure. 100 is more than enough for it to operate at max efficiency.

Yeah I suppose flushing at high pressure is a bit better but it won't really make much of a difference.

Andrew

Thanks Andrew.