In any acuarium shop you can buy very cheap Ph meters, visual ones (paper pieces wich take a color depending of ph level). But digital ph meters are more accurate and a good investment in any grow.

But the main question about if use tap water or not, isnt the ph, that you can adjust easily, but the salts concentration. A high salt concentration is usually letal for your babies, locking some nutrients absortion.

A EC or PPM analysis of your water is required. Levels <= 0,4 mS/cm are valid generally. Up to 0,6, but in this case, its better to perform a detailed water analysis. In my country, in the city council give it for free, as well as the water distribution company (legal obligation). Ask if the same in your country.

You must take note of the Na, Ca and Mg level specially. Na is very toxic for plants at high concentrations, and with Ca, can block other nutriens absorbance.

If your tap water is hard, the best way is use RO water.
knna Reviewed by knna 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