This Video Helps Explain How to Ph and How it works.

Hanna teaches some basics and what not to do with pH Pens

All about chlorine and Chloramine.

How to soil test with Rapitest.

Everything you need to know about pH ( Hanna school )

Another Video about the pH range for nutrient uptake

Below is an uptake chart. This shows the optimal pH range for cannabis in SOIL is between 6-7.Hydroponics is a whole different range. ( see below )

 

Below is another chart showing the different uptake ranges for hydroponics.