I am gonna catch shit for this but believe me this works! I have been using this for around 8 months now and I have saved a ton of money.
For PH DOwn
Go to an auto parts store and buy sulfuric acid yes Battery acid, You can dilute it to around 1/2 cup acid to One gallon of water.
If you need PH UP go to Lowes and Buy Roebic Drain opener its 100 percent pure Sodium Hydroide. Do NOT use drano or anything else you need 100 percent sodium Hydroxide. mix about 100 grams of the stuff to one gallon of water.
Now you just spent about 15 bucks for all the ph up and down that you will use in 2 years.
If you check with commerical growers they will tell you the same thing, Sulfuric acid for down and sodium hydroxide for up.
Just dont tell any weed growers about this, (Sproutco was banned for it) But believe me it works. However if you wanna keep paying the Hydro stores for water to the tune of about 30 buck a gallon go ahead.
Uhh ohh I think someone is gonna string me up for this!!!!!!!!!!!