didnt realise that rookwool was so hard, dont wanna run before i can walk. I was after the EC/PH testers there about £10 each or about $20 off ebay local to my area. 90% of my kit is home made, i was gonna use and ebb and flow system on a timer to feed my plants and have clay pellets in the base of my pots so the water would run off quickly without the soil filtering throught blocking my pipes and pump 'see pic attached'.