I blasted my hydroton with 4.8ph and cycled it all night, seem to do the job... I bought one more 45litre bag to level out all the pots , except I threw it in the tub and ph'd it this time... what a mess! Glad I didnt do the first 5 bags in the tub... I rinsed my rez out, my tap ppm is 40ppm , but the rez was hovering around 300 with the hydroton crap in it,,, it cleaned out well.... 50ppm... yea, im ready to nute it up , adjust the ph and throw my rooting clones in tommorow... glad i read all your stuff, it helped me get through the new hydroton zone! I have a few clones I over watered and are slow to root, damn noob... I was even going out of my way to not get the rockwool too wet..