[Slash]

I have a 450 gpd RO in my shed and forgot I had another 300 gpd tucked away in the corner,the 450 RO has 3 X 150 membranes while the other has 3 X 100 membranes,could I add these 3 x 100 membranes to my 450 unit or does all membranes have to be the same on the RO unit,just a thought as it could speed up production on my static system,your views would be appreciated.

[Alex Gardiner]

Simplest is to plumb both in to work in parallel. You also will have a fail-safe in case one packs up.

[matt]

well you can either

split the incoming pipe to the 2 RO units ( like alex said )

or

use the 2nd RO connected to your waste from your first, the downside is the 2 RO will not last that long, BUT if your on a water meter, less waste is good

personally i would go with the first option