Saturation ~1.51 g/L at 25 C (5.7 g per US gal); BRS suggests 1/2-1 1/2 tsp per gallon for ATO use (excess settles). Clear supernatant contains ~818 ppm Ca / ~40.8 meq/L (114 dKH).

• Dose only as saturated (or partially saturated) limewater, dripped slowly into a high-flow area, ideally at night; never add powder or slurry directly to the display.

• Volume is limited by evaporation: limewater should replace top-off water, not exceed it (salinity).

• Limit pH rise to <=0.2 per dosing event (BRS) and stop/reduce if tank pH approaches ~8.5.

• At saturation, replacing 1% of system volume per day adds ~8.2 ppm Ca and ~1.14 dKH/day; 2% doubles that - can exceed 1.4 dKH/day in low-demand tanks.

• Adds Ca and alk in the CaCO3 ratio (20 ppm Ca per 1 meq/L alk); cannot fix an existing Ca/alk imbalance.

• Solubility is retrograde: colder water dissolves more (~1.7-1.8 g/L near 0-20 C, ~1.5 g/L at 25 C). Undissolved powder settling on the bottom is normal; keep pump intake above it.

• Caustic: avoid eye/skin contact and inhaling dust.

• A crust on the reservoir surface is CaCO3; old/agitated limewater loses potency.

5.722 g made up to 1 US gal total.