Polish, I explained what TDS/PPM is simply because nalani said 'I've got no idea what you mean by TDS/PPM though'.

I don't grow in a hydro setup, nor have I any experience with coco, so I dont offer advice on maintaining one. I will however try to help people understand things that they don't understand already. :S3:
Wobster Reviewed by Wobster 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