[advanced]

Any one  know  of a. Ro system that doesn't waste so much water

Thanks 

[SeanK]

There isn't one, if you have everything in your favour you could get 60/40 pure to waste but that's the best your going
to get.

[Rob clarke]

Any one  know  of a. Ro system that doesn't waste so much water

Thanks

http://www.purefreedom.co.uk/water-purification/2400-gpd-high-volume-reverse-osmosis-system-40-membrane-40-hf5-1016.html I haven't got one, it says using a booster pump a ratio of 1:1 can be achieved but how true this is I don't know

[andyM]

There isn't one, if you have everything in your favour you could get 60/40 pure to waste but that's the best your going
to get.

I get 50/50 ish

[a900]

I run mine about 60 waste/ 40 pure. That gives me the best output tds of 7. I'm happier wasting a bit more water if it saves resin and will make my 4040 membrane last a bit longer especially so with an input of 400tds.

It's just the nature of the filter

[M & C Window Cleaning]

I run mine at about 70-80 psi and get a little better than 60/40 waste to pure. It's a  FilterPlus 300gpd unit with the flow restrictor from my old PF 300gpd RO on it as the one that came with it was very wasteful.

[SeanK]

There isn't one, if you have everything in your favour you could get 60/40 pure to waste but that's the best your going
to get.

I get 50/50 ish

I would be the around the same (4040 membrane), that said I probably could have got around the 60/40 when the membrane
was newer.

[SeanK]

I run mine about 60 waste/ 40 pure. That gives me the best output tds of 7. I'm happier wasting a bit more water if it saves resin and will make my 4040 membrane last a bit longer especially so with an input of 400tds.

It's just the nature of the filter

That's actually very good, I think the 4040 is supposed to work around the 98% removal mark and your slightly above that.

[a900]

I run mine about 60 waste/ 40 pure. That gives me the best output tds of 7. I'm happier wasting a bit more water if it saves resin and will make my 4040 membrane last a bit longer especially so with an input of 400tds.

It's just the nature of the filter

That's actually very good, I think the 4040 is supposed to work around the 98% removal mark and your slightly above that.

Our tap pressure is 80psi and used to run the system at 70 but running it at a lower pressure (60) with more waste is making it more efficient as far as tds readings. 

I wonder whether to go for a hf5 next time as it might work better at that pressure.

[SeanK]

I run mine about 60 waste/ 40 pure. That gives me the best output tds of 7. I'm happier wasting a bit more water if it saves resin and will make my 4040 membrane last a bit longer especially so with an input of 400tds.

It's just the nature of the filter

That's actually very good, I think the 4040 is supposed to work around the 98% removal mark and your slightly above that.

Our tap pressure is 80psi and used to run the system at 70 but running it at a lower pressure (60) with more waste is making it more efficient as far as tds readings. 

I wonder whether to go for a hf5 next time as it might work better at that pressure.

I wouldn't change anything if I where you, to get your tds down to 7 from 400 with only 60% waste is going to be hard if not impossible to beat.

[advanced]

thanks for all your replies not sure what  mine is  I got a 300 gpd  ro  that is used with booster pump   with 20  inch prefilters   bought from omnipole  ten years ago .
what I do know is water bill is  not cheap  as I'm on a metre .

[a900]

Can you get a rebate back for the waste? I have so saved me a bit as the water either is used away from home or goes into the soak away.  saves me about £140 a year.

I'm sure if you sub metered the ro and the waste went on your grass you wouldn't have to pay sewage charge on the water used.

[Spruce]

thanks for all your replies not sure what  mine is  I got a 300 gpd  ro  that is used with booster pump   with 20  inch prefilters   bought from omnipole  ten years ago .
what I do know is water bill is  not cheap  as I'm on a metre .

Our 450 GPD r/o was fitted with an nonadjustable 3 to 1 inline restrictor. About 10 years ago RoMan also supplied a 5 to 1 restrictor for high tds tap water.  So in our case it took 4 liters of tap water to produce 1 liter of pure.

SeanK has often posted about weighing the costs of consumables to find the most economic path to take.

I've seen posts over the years that the cost of water on a meter has caused operators to restrict that waste to a point that replacing membranes once a year was cheaper than the cost of all that waste water going down the drain.

I seem to remember some post where the windie restricted waste to about 1 waste to 3 pure on his r/o  although my memory of the exact details is a little sketchy.

I'm pretty sure that in one of the early videos Lee Pryor posted he referred to a system he was using that feed a portion of the waste back into the r/o to also save water. I can't remember its name (Ro****) and he didn't elaborate about where it came from.  I did ask what it was in the thread but he never responded to my question.

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