do you mean test the runoff of a pot filled with soil, before you introduce the plant? Thats a good idea...kinda like washing your soil! I have been using tap water that I let sit out for about 24 hrs to allow any chlorine to evap. Unfortunatley I dont have a 15 gallon container...the largest I have is a 2 gallon water jug. Hopefully I dont create bigger probs by not letting the chlorine evap.

Thanks for your help!
SeaLevelGrower Reviewed by SeaLevelGrower on . UPDATE...PLANTS STILL YELLOWING Sorry if I double posted...I added this to my last post and think I am causing some confusion, so I posted in a new thread. What is your experience level? NOVICE Your Equipment: .1) Type and wattage of lights. T-5 .2) Distance from tops? 2 IN .3) Reflector type? T-5 SET UP .4) Is there a consistent fresh air supply? NOT AS MUCH AS ID LIKE...CLOSET GROW FOR VEG. DOOR STAYS OPEN ALL DAY .5) Do you have an exhaust fan and a circulation fan? NO EXHAUST, YES CIRCULATING FAN Rating: 5