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When the water level in the sump or aquarium drops below the LOW LEVEL (3) on the sensor
Dosage may be adjusted according to perceived benefit to aquarium
Do not ever put into an aquarium containing live fish
Shorten cycling time
wipe with cloth
JBJ Nano ATO used When the water level inJBJ's Most Advanced ATO The JBJ Nano ATO is the perfect upgrade for your aquarium. JBJ's most reliable auto top off system is reimagined with dual optical level sensors for ultimate precision. Enjoy the compact versatility of a digital sensor without ompromising the security of overfilling your tank. Installation is quicker than ever, and everything you need to get started is included in the box. Optically Accurate The included protective cover