Growing for several years now with go o d results with white widow, vanilla kush and super skunk in both fox farm and coir/perlite using 400watts led, GH floura w/CaMg. My issue is high pH --like 7 plus. First month is fine @6-7 but by early bloom the pH starts up. Leaves start showing small tiny tan dots that increase over 2-3 weeks till the margins are filled. The whole leaf becomes pale tanish with light green veins. This happens when I'm unable to reduce pH to less than 7. Thinking lock out. Have gone to as low as 4.5 in and get 7.3 out, even after sevetal flushes with floura-kleen. Have tried both RO and tap and a blend of both with same results. My tap is 180ppm so I try to stay with RO or Distilled with micro/CaMg. Is there any kind of buffer I can try to help me with high 7 plus out water.
