[Ale]

Belassi - Thanks! I really don’t know much but what I read in the internet and there is too much information; so I was not looking at the right products. I will look into those you mentioned. Hopefully I can find a distributor to sell in small quantities. I haven’t seen many companies in Mexico selling in small quantities these type of products as in other countries. 

Dr Catherine Pratt - Thank you! I will try those percentages and see how it goes. And I’ll check for a test kit in Mexico. As for the book, can you please recommend one that is easy to understand? 

EVchem - Thanks! I will check in Amazon for a pH meter.