Without a tester there is no way to determine the pH.

www.discounthydro.com has the best pens for the best price...in my opinion.

If there is a Worm's Way near you, or any hydro store, they have them.

pH is so critical that to water without it in an indoor setting is asking for failure.

Outdoors has a lot of environmental elements that will buffer the water naturally. Indoors does not.

Get a pen.
HARDDON Reviewed by HARDDON on . What kind of water to use I read a thread that said not to use tap water? What kind of water is good then, deep park? haha.. I'm not sure if they were ok. Someone just let me know. So Im sure. Rating: 5