Quote Originally Posted by Pass That Shit
Rain water has the right pH for every plant :thumbsup:
Let´s just think about this for a minute,

Rain water has the right ph?
Yes in most cases it does have, but u should allways test it 1st...

What other elements can u find in rain water???
That really depends where u live doesnt it???I´m pretty sure that if u live in a very industrial area you will find lots of chems in the water that are not suitable for your plants, and the water ph might not be what u are looking for...

I have tested rain water ph many times and i can tell u the ph its not allways the same, i never had the chance to send it to a lab and test it but some users in the forum have and the results werent to good...

So this is what i allways do....

1st - Get tap water, let the water rest in a bucket for 24 hours so the clorine can evaporate.

2nd - After test the water ph (allways)

3rd - Use Ph up and Ph down solutions to get the Ph between 6.3 and 6.8.
Phosphoric acid to raise pH and potassium hydroxide to lower pH.

4th - Do not use fish chemicals to adjust pH.Toxic buildups can occur.

This method has been described in books such as:

Greg Green´s - "Cannabis Grow Bibble"
Todd McCormick´s - "How to grow Medical Marijuana"


So unless u have ur rain water properlly tested NEVER use it ...