This grow ain't broke. I see nothing to fix.
You can run coco just fine on most tap water, using correct ferts, unless your tap water is unusually bad. I've done it. You just need to run by the numbers, with a good EC meter. It's a matter of knowing your background mineral content and adding calmag if needed. Coco grows require more calcium than other media.
stinkyattic Reviewed by stinkyattic on . pH in hydroponics (auto-drip coco)??? I recently got my plants a hydroponic system, but keeping the pH level in it at 5.5 - 6.0 is really difficult. The water with nutrients in it is at about 6.8, and then we add "GHE pH down" which lowers it to 5.5 - 6.0. But after a few hours its back to 6.5. Could the problem be that the plants are eating up the nutrients and leaving the pH closer to clean water pH? :P And should i just leave the pH at 6.5 ? Oh btw, plants are just about 10cm tall, growing a bit slow compared to what i'm Rating: 5