Noobs Hydro 1st Grow

Plant are coming on ok. Im using a Shed load of PH down every morning PH levels are raising 2 points. Nutes tank is cloudy after 2 days. I posted a question and was advised to remove the air stone, which I have. PH is more stable but still rises, less than before but and has to be adjusted every day. PH in the tank is 5.8. Run off is 7.5 WTF ?? Leaves look a little pale Hope i havent cocked this up.. Ive ordered a filter and am going to try Reverse osmosis water, Ive also heard that the Rhiizo increases the PH so Im thinking I may drop this in the next mix and use A and B only.