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Hello, I bought the XP Aqua Duetto, a Auto Top Off (ATO) for compensate the water evaporation from the aquarium. It's a really tiny device, and do exactly what you need. Its also super precise, and despite what the company said about small aquarium and a tiny overflow, it just work perfectly on my VERY small return chamber on my 9G Nano Reef aquarium. I like this device a lot and I think I might buy another one, it save me a lot of time and I have that piece of mind. If you interested about it I made a video with some tips to help you:

Folks, For those of you who own the XP Aqua Duetto ATO, have you encountered an issue with the sensor? Currently, I'm experiencing a peculiar problem. I just wanted to check-in and see if anyone else has faced the same / similar situation. My ATO reservoir is filled to the right level and my power outlet is all good. When the water level in the sump falls below the sensor mark, I don't see any refill happening. The blue LED on the ATO unit keeps circulating, and then starts flashing and beeping after 5 min or so. But the pump doesn't activate and pull up water from the reservoir to the sump. Initially I thought my pump is busted, but I connected it with the Smart ATO in my other tank, it works perfect. Also, I noticed this - when I submerge the sensor into the water the blinking stops. But post evaporation it doesn't reconcile the process, and we are back to square one, no water being pumped up. I have tried all the troubleshooting steps per the manual, but no success! That being said, has anyone of you engaged @XP Aqua for warranty assistance? Any pointers either to help fix this issue or get support from XP Aqua is greatly appreciated 🙂 Thanking everyone in advance!

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