[Lee GLS]

just looking around at the price of 4040 membranes, and deciding on what to get, but does anyone use filmtec 4040 membranes? i know there are the hf4/5, but does anyone have experience with both? what is the best to get, my tap pressure is 80psi

[dd]

80psi will give you good performance from your membrane. Is it for a static system or a van mount.

[Lee GLS]

It's a van mount, i already have a filmtec but the hf4/5's are more common, but I've been happy with my filmtec but didn't know if the others were better

[dd]

I find June at Gaps water good for advice. If it was a static system I would have suggested a 300gpd unit as the membranes are cheaper and there is less waste water. (Tend to be a bit slow for van mounted systems).

[Sapphire Window Cleaning]

I find June at Gaps water good for advice. If it was a static system I would have suggested a 300gpd unit as the membranes are cheaper and there is less waste water. (Tend to be a bit slow for van mounted systems).

Are you sure?
4040 ROs produce less waste than the ROman type systems, you just need to adjust the waste tap!



Matt

[dd]

I find June at Gaps water good for advice. If it was a static system I would have suggested a 300gpd unit as the membranes are cheaper and there is less waste water. (Tend to be a bit slow for van mounted systems).

Are you sure?
4040 ROs produce less waste than the ROman type systems, you just need to adjust the waste tap!



Matt

My 300gpd ro-man unit has 3 membranes so the waste water is recycled twice. 4040 membranes  usually run best on a ratio of 30 pure/70 waste. If you reduce this to 50/50 you will shorten the life of the membrane and the product water may not be as good.

My 300gpd runs around 50/50 and gives tds 004 from a 200 tds supply. The membrane is nearly 2 years old and still going strong (partly due to me using a water softener).

[Sapphire Window Cleaning]

I use a 500GPD (5x100GPD membranes) RO man system on a static using a aquatec booster pump.
Are you sure the ratio is right? 30 pure to 70 waste? thats about the same as the Merlins.

During the summer I can get 60 pure to 40 waste that is with a booster pump.




Matt

[dd]

I use a 500GPD (5x100GPD membranes) RO man system on a static using a aquatec booster pump.
Are you sure the ratio is right? 30 pure to 70 waste? thats about the same as the Merlins.

During the summer I can get 60 pure to 40 waste that is with a booster pump.




Matt

30:70 is the ideal ratio for a 4040 ro membrane, although many run them around 50:50. With your set-up I am guessing the membranes are in line so you would recycle your waste water 4 times. Did you need to go for 5 membranes? Just curious. Mine is a static system so slow water production is not a problem.

[luther1]

Matt,hows business where you are now,picking up?