Any time the pump looses power and reboots when it gets power back does it have to refill all the way to top line for measurement? Or is it a one time

Yes it has to refill to the top sensor so it can recycle, also if water level goes way below sensor when it reboots it will only pump 3 times then red light comes back on so unplug and plug back in so it can pump remainder water to reach level you might have to do this several times( i hope not) usually once is sufficient, hope this helps.

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💧 Never worry about your tank’s water level again — precision meets peace of mind!

ROBUST RELIABLE - Strong magnets support up to 20mm thick aquarium walls with included check valve to stop backflow.
COMPACT POWERHOUSE - Sleek 0.7-inch design fits rimmed or rimless tanks effortlessly.
HIGH PERFORMANCE PUMP - 70 GPH pump lifts water up to 2 meters, perfect for large reef or freshwater tanks.
SMART TECH SAFEGUARDS - EFTT, AFT & QST 2.0 technologies prevent overfilling and pump dry runs with real-time alerts.
PRECISION WATER CONTROL - Dual optical sensors maintain water fluctuation under 0.6 cm for ultimate stability.

The Fzone Aquarium ATO Auto Top Off System is a compact, high-tech solution designed for both reef and freshwater tanks. Featuring ultra-precise dual optical sensors and advanced filling technologies (EFTT, AFT, QST 2.0), it ensures stable water levels with real-time alerts to prevent overfill or dry pump runs. Its powerful 74 GPH pump and strong magnets make installation easy and reliable for tanks up to 20mm thick, delivering consistent performance for aquarists who demand precision and safety.

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Brand	FZONE
Material	Plastic
Product Dimensions	35L x 20W x 7H Centimeters
Item Weight	63 Grams
Specific Uses For Product	Indoor
Style	Compact
Colour	Black
Included Components	Powerful Magnet, Check Valve, Hose Holder, 70 GPH Water Pump
UPC	764595878146
Vivarium Type	Aquarium
Manufacturer	FZONE
Item model number	FZ-360P
ASIN	B09YVP3L22

Fzone Aquarium ATO Auto Top Off Refilling System with Dual Optical Sensor for Both Reef and Fresh Tank （360P)

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