so your saying the the birthcontrol pills and all that shit that in water is not in the water come on man read a book look at the news sometime eating a dirty diaper is the same as eating nuti its all shit...Lol and if the salt build up and the plant waste will not kill your grass then why...
Welcome to rollitup farmer if your going to do the dro start off with a DWB that stand for deep water bubbler all you need is fish tank airpump and airhose and a bubblestone then your going to need a rubbermaid tub the 10gal works great. The next thing on the list is to measure the circumference...
Yes you can just make sure the the water can hit the cup and don't change the water for two weeks just keep it PH and it should work just fine ......good luck on your grow