If you have a tank without a sump or filtration chamber (like in an all-in-one) and you’re looking for a way to take advantage of automatic water top offs, check out the XP Aqua Sumpless ATO.
The design uses the XP Aqua Flexi Surface Skimmer and the XP Aqua Duetto ATO to give you method to add filtration box and a method to detect water level dropping and deliver the top off water. You could also solve the issue with an optical sensor, like the Duetto ATO on its own, but adding the Flexi Surface Skimmer gives you an option to skim the nasty oils off the surface or to push tank water up and through the media. While the addition of the internal box takes away from a nice clean look, adding another level of filtration is a nice touch.
The setup is pretty simple. Just assemble the Flexi box and attach to the glass with the magnet. Install the sensor in the box at your desired level, connect the feed pump to the delivery hose and insert in your ATO reservoir.
The new XP Aqua Sumpless ATO is available at Marine Depot for $149.99
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