He he he... its a good thing you disabled your rep polishpollack. I dont know if you can get negative rep but you'd be down there if you could judging by that post and another I've seen.

TDS/PPM - Total dissolved solids/parts per million.

This is the amount of other things in your water apart from the water itself. Sodium, Calcium, Magnesium etc. A TDS meter is a vital piece of equipment if you are growing in hydro. Without it, success is going to be near impossible.
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