[Cliff perkins]

hi
I'm moving house soon and going on a water meter and would like to save water.
would a twin 4040 reduce my wastage or increase it.
also how would i set up the pipework for the two 4040s
can't find any diagrams on the internet.
any help or info on saving water appreciated.

regards cliff

[dave0123]

Go to gapswater.co.uk there's a little diagram on where the pipes go regarding the second membrane

[LBWCS]

hi
I'm moving house soon and going on a water meter and would like to save water.
would a twin 4040 reduce my wastage or increase it.
also how would i set up the pipework for the two 4040s
can't find any diagrams on the internet.
any help or info on saving water appreciated.

regards cliff

I was gona post exactly the same question. I'm interested on getting the best pure water/ waste ratio. Possibly recycling the waste into my existing Merlin

[Cliff perkins]

looked at gaps but picture not to clear.
does any1 do it on here and are there more than 1 way to set up a twin 4040

[dave0123]

http://www.gapswater.co.uk/acatalog/Twin-RO-kit-1190.html

Thats what i meant, it show you hows its connected up, its not a great diagram but you get the idea

[steveo22]

I'm also very interested in going for this this type of set up, any info, diagrams and pics would be great.

[dave0123]

click the above link  it will show you the way they are connected from waste

[Clever Forum Name]

I thought the best way was to have the waste from the first 40/40 going into the second 40/40 as the input.

I was told the filters on the second 40/40 dont last as long as the first. But filters VS waste costs makes it very worth while.

Or have I been sold a load of poop lol

[Spruce]

I thought the best way was to have the waste from the first 40/40 going into the second 40/40 as the input.

I was told the filters on the second 40/40 dont last as long as the first. But filters VS waste costs makes it very worth while.

Or have I been sold a load of poop lol

No, you are 100% right. That is the way to do it to save water.

R/o membranes will have to be replaced at the same time so an expensive outlay. Water purity will be poorer as the higher pure ppm from the second r/o will 'contaminate' the pure from the first r/o increasing resins costs a bit.

[robert mitchell]

I think you have to do the sums according to your tap water ppm .

for instance some people have 400ppm from the taps so the waste stream would be very high ppm.

However if you have 200 ppm from the taps the waste stream going to your second ro is still likely to be less than 400 ppm .

The lower your tap tis i think the more it makes sense to plumb them in series .

unless its low enough to go di  only.

[Clever Forum Name]

I think you have to do the sums according to your tap water ppm .

for instance some people have 400ppm from the taps so the waste stream would be very high ppm.

However if you have 200 ppm from the taps the waste stream going to your second ro is still likely to be less than 400 ppm .

The lower your tap tis i think the more it makes sense to plumb them in series .

unless its low enough to go di  only.

Christ i have 475ppm 

[Spruce]

I think you have to do the sums according to your tap water ppm .

for instance some people have 400ppm from the taps so the waste stream would be very high ppm.

However if you have 200 ppm from the taps the waste stream going to your second ro is still likely to be less than 400 ppm .

The lower your tap tis i think the more it makes sense to plumb them in series .

unless its low enough to go di  only.

Our tap tds is 115. I'm sure I once checked the waste tds of nearly 200. R/o isn't on at the moment as the IBC tank is brimming. I will take a reading next time the r/o is on this week.

[sham33]

If you have waste from the first 40/40 going into the second 40/40 as the input does that mean you're producing more water per hour because theres no waste water outlet ?

[Clever Forum Name]

You still have a waste. But it's on the second RO.

two separate 40/40 Ro's would produce more pure that a twin 40/40 with recycled waste.

[robert mitchell]

Either set up will produce more water than a single ro but the above is correct .

In series will reduce the amount of waste wAter.

Connected in parallel production should double assuming you have adequate pressure and flow to feed both .

[Spruce]

I think you have to do the sums according to your tap water ppm .

for instance some people have 400ppm from the taps so the waste stream would be very high ppm.

However if you have 200 ppm from the taps the waste stream going to your second ro is still likely to be less than 400 ppm .

The lower your tap tis i think the more it makes sense to plumb them in series .

unless its low enough to go di  only.

Our tap tds is 115. I'm sure I once checked the waste tds of nearly 200. R/o isn't on at the moment as the IBC tank is brimming. I will take a reading next time the r/o is on this week.

At the moment tap tds = 90, r/o waste = 141

[robert mitchell]

Spruce , i think a double ro in series would work well on your tds as your waste stream is lower than a lot of ro users tap tds.

of course if your not on a meter and your making enough water probably not worth your while .

[Cliff perkins]

after reading this lot,is it worth while to go twin 4040 if your on a water meter or is the water savings just not worth it.
im intrested to know from any1 thats on a water meter if it makes much sense,i.e. the water you save via water bills and costs of replacing the membranes and if they need to be changed more regular etc.

regards

[Clever Forum Name]

Be handy to know what your tds is and amount of L you need a day............

[Spruce]

Spruce , i think a double ro in series would work well on your tds as your waste stream is lower than a lot of ro users tap tds.

of course if your not on a meter and your making enough water probably not worth your while .

I think another issue would be the volume of water available. I don't believe we would have enough so would have to consider a booster pump. At the moment the single r/o works fine and produces more than enough for us and we also aren't on a meter.

Going from the old 450 gpd RoMan type r/o to this has reduced our waste water anyway.