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If using dry ice
and re-test before another small bump
MRL-exempt: No residue to worry about
so it won't stall on organic debris or undissolved nutrient salts
HGV Condition - PH Up, 55 Gallon hub If using dry ice17% Potassium Hydroxide pH Adjuster for Commercial Reservoirs Built around 17% potassium hydroxide and matched to the HGV Nutrients three part chemistry, this pH up shifts reservoir pH on a few mL per gallon. The salt profile stays predictable across the feeding window. The 55 gallon drum sizes it for central dosing systems, room scale fertigation skids, and cycled batch tanks where a hobby volume bottle would empty inside a week. Run it diluted.