[j timms]

Hi People
    my ro membrane is producing a tds rating of 030 prior to the resin.  Is it time for a new membrane?

[Michael Peterson]

depends wht its going in at, if you dont use a booster pump that will lower 30, they could do with a change really mate i should think but if it were me i would double di and wait unti it goes to about 40

[GoodFella2006]

http://www.ebay.co.uk/itm/Amfor-Ultra-Low-Pressure-RO-Membrane-50-75-100-OR-150-GPD-1-3-OR-5-Pack-/120951483803?pt=UK_Pet_Supplies_Fish&var=&hash=item1c29452d9b

If you are using a small RO,cheaper to change the membranes than using lots of resin.