Background is in this thread, just started. http://forum.grasscity.com/hydroponic-growing/1280361-underground-grow-underwater.html QUESTIONS! PLEASE HELP! ------Ok so heres my first struggle. Ive been keeping my ph at 5.8ish. But every 5 or 6 hours its back up to 6.4-7 I dunno wtf is going on. I assume its because i didnt soak my hydroton overnight, just kept soaking and rinsing it for an hour to remove buildup. My water temp is 65-68 degrees. Ive been adding ph down from general hydroponics, then waiting a few hours to test again. Leaves look nute burned. Ppm is 700-20ish. ------What am i doing wrong? Im about to flush, scrub the buckets and start over. Im using distilled water. ------My ppm on my tap water is 150. If i let it sit with an air stone to evaporate chlorine, can i use this instead of store bought? Store bought distilled is getting expensive! Second question: How do i purify rain water to remove any dirt/dust? I usually just filter it through some old T-shirts It raining right now. Any help is appreciated, thank you. Gonna add a pic from my ipad. Forgive the quality and the fact its not a thumbnail. Ill fix it later. ps, plants are green, they just look yellow from the light. Also, my nutes are 10+ years old. Could this have an effect?