[matt]

ive just found the membrane housing i brought from RO-MAN a while back, it was to put my order over the free postage price band, thus the membrane was free (ith was either pay for postage or the membrane)

Mine now is either 50 or 60 gall per day, i cannot remmber and its 2 years old now

any1 any advice for me, drawings of what the set up is like etc etc

do i need to stick to a certain size membrane

[steve m]

go on their website and click on upgrades, it gives a diagram there

[matt]

cheers steve

any1 done this

it looks like the waste from the first goes to the 2nd membrane

i have a 50 or 60  GPD now, its about 2 years old

i was thinking of getting a 100 GPD and putting that first, then the 50 GPD after the new 1

will i cut down on waste water by much ?? ?? ??

[Extremeclean]

Matt

Do you have a spare membrane as well as housing?

If you do and its a 50GPD one putting it after or before a 100 GPD one wont be much use I think.

All you will do is restrict the flow to the size of the smallest membrane I think.

If you just have a housing and want to go to a 100GPD unit add a 50 GPD membrane. The housings will take membranes from 30 GPD to 100 GPD.

According to the RO-MAN site you should cut down on waste a lot.

[matt]

Matt

Do you have a spare membrane as well as housing?

If you do and its a 50GPD one putting it after or before a 100 GPD one wont be much use I think.

All you will do is restrict the flow to the size of the smallest membrane I think.

If you just have a housing and want to go to a 100GPD unit add a 50 GPD membrane. The housings will take membranes from 30 GPD to 100 GPD.

According to the RO-MAN site you should cut down on waste a lot.

hi

i just have a housing

so i need to add a 50 GPD then

Hmmmmmmmm as the existing membrane is 2 years old, it might be better to get a 100 GPD and ditch the 50 GDP, as then i can add another 100 at a later date, as the 100 is only 3 quid more than the 50

i s.pose i could just run the 50 GPD on its own system, as my water pressure is fairly good

[John Walker]

cheers steve

any1 done this

it looks like the waste from the first goes to the 2nd membrane

i have a 50 or 60  GPD now, its about 2 years old

i was thinking of getting a 100 GPD and putting that first, then the 50 GPD after the new 1

will i cut down on waste water by much ?? ?? ??

This is a question I've asked before as I've seen two ways of connecting multiple membranes but I didn't receive a positive reply.

One way is for the waste from the first membrane to feed the second membrane and the other way is to connect membranes in parallel.

I would have thought that if the waste from the first one was feeding the second, it would make the second unit have to work much harder as the ppm would be much higher.

Anyone got the full answer to this?
John

[steve m]

if you fitted them in parallel you would have to slit the line a fair way away and maybe put a balance pipe in between to keep the water pressure up and constant. At least if you put them in-line yes the second membrane will work harder, but the water pressure will be there

[matt]

RO-MAN does a fitting that splits 1 into 2

i use it for my irrigation system for the garden

[freshwater]

Multiple Membranes:

Variation 1: Connect all the inlets together, connect all the drains together, connect all the outputs together. REMEMBER that each drain needs a restrictor or a needle valve to control all three. If you do this you can add all the outputs membranes together eg 100 + 50 + 50 = 200. Remember that you need prefilters that can cope with the flow.

Variation 2: Connect the drain from one or two membranes to the input of another membrane. The TDS from the drain of the first membranes will be higher tan that your input water. The water produced from the last membrane will therfore be higher that the first membranes but you will be saving water.

Variation 3: As above connect the drains from the first membranes to the input of another membrane. Then take the output from that membrane and run it back to the input of the first membrane. This will not increas your total output but will save water and will improve the quality of your output.

Variation 4: For the best quality take the output from one, two or three membranes and feed it to the input of a second membrane, take the drain from the second and feed it back to the input of the first.

Variation 1 is easy to set up and as long as you have the correct drain restrictors works well every time. Variations 2, 3 & 4 require carefull set up to prevent too much back pressure on the initial membranes. If done right is will cut down on your water bills or improve you water quality.

[steve m]

does it affect the life of the membranes?

[matt]

drain restrictors

what are these ??

and

where can i get them from ?? ??

as Im thinking of 100 GPD and 50 GPD