HydroFarm Gorilla auto

I've kept the nutrient balance from the second week, because I did start feeding them a bit early and I've got some burned leaves because. My reservoir PH is everyday over 7!!!! The "Phdowning" is necessary daily. I decrease the solution near to 5 and subsequently day by day. It looks like a endless battle.After some research I've figured out that the clay pebbles I'm using are has low quality which contains dust, and I also found that this pebbles has ph around 7. I'll keep ph downing my reservoir daily. I did stop using distilled water. I'm just filtering my HARD water in a conventional kitchen filter. the ppm is around 150 and I will try anyway.