Hi guys been wfp now for a year now ( love it soo much safer ) I still have the old 2 x 200 gdp membranes but it is so slow filling up my 550 L tank ! Can anybody give me advice on a new 4040 system as my water pressure is not great would I need a low-pressure one and could you advise me on which one to buy thank you so much for your help , Amos .
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