neil

what are your ph readings for your tap water and ro water and do you add a buffer to your tap water to get it to 6.5.

i agree with rob about adding more ro water but you must find out what readings are of water going in

depending on this will depend on what ratio/mix of ro/tap water you will use

what i did was measure ph of tap and ro and then had found a mix ratio to get my ph to 6.5 and also add a little bit of buffer 6.5 to stabile it.

hope this helps

delboy