would probably buy a quart size of cal mag as the directions for 1-2 teaspoons per gallon if that helps determine what size you may need.
you may also want a larger bottle of ph down while you probably have enough ph up to last a lifetime.
bejay Reviewed by bejay on . A few simple questions on Cal Mag and ph meter I'm sure all my answers are plastered around here...I keep looking, but blech. I finally ordered a ph digital cker by Hanna (I saw that Stinky recommended those) and some ph up and down. Also purchased the storage fluid for the meter. I did not get the cleaning solution, however, is this an issue? What do I use in lieu of the cleaner, distilled water? Rubbing alcohol? Peroxide? I ordered pint size of these up and down. Is the brand going to be that big of an issue? I bought Eco-Chem. Rating: 5