hey whats up j? owzit? as far as th ep.h rising goes good call on the lowering the airstone.I run dwc in my veg area. THe p.h stays stable i change my nutes oute every 2 weeks religiously. never just change em out. this is how i do it:
1: pull plants and rinse the roots out with ph'd water.
2: take the entire system out including airstones and lines.
3: soak the stones and lines while i clean the rest of the system
4: clean the system w/ bleach and water
5: rinse, dry and then repeat the process one more time
6: fill and run the air stones prior to putting the plants back in to ensure everythings working properly.
7: sit back
and and be happy its over with for another 2 weeks!!!
Well this is just my process and its been working for years. Just a thought and some info for you to meditate on. I hope it helps in you some way. Now go take a