Yes, it’s possible to make stronger solutions of Calcium and Magnesium. In order to keep it safe, we recommend preparing doses maxiumum 2 or 3 times stronger. Solution of higher concentration may clog the pump. KH Buffer is a saturated solution, therefore you can’t get higher concentration.
It’s natural residue and it’s perfectly safe to use.
Yes, you can use, nothing dangerous was created there – while the productivity of bacteria may have been reduced. Some microorganisms may have survived in spore forms. It is better to avoid freezing the product.
