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Calcium forms with carbonates and bicarbonates an insoluble compound called calcium carbonate
Particularly do not introduce foreign strains of bacteria such as "live sand"
The sliding color chart along with the six-cavity test plate allows for easy reading and comparisons of several samples at the same time
NEPTUNE SYSTEMS APEX PROBE CONDUCTIVITY/SALINITY CALIBRATION SOLUTION 53000 µS (5 PACK) D-D The Aquarium Solution Footprint: 353000 S Conductivity Calibration Solution Use this calibration solution to calibrate your Conductivity Probe and PM2 for saltwater salinity monitoring applications. Conductivity probes can be used for many different functions from letting you know the salinity of a tank to the quality of RODI water. We suggest calibrating conductivity probes once every 3 6 months to keep readings reliable. 447 S Conductivity Solution Used for calibrating conductivity
