Dosing Pumps and Auto Top Offs
What is an ATO? An aquarium Auto Top-Off system measures water levels in the aquarium or sump. When the automatic top-off sensor detects a drop in water level, a pump sends fresh water from an auto top-off reservoir into the tank.
The best auto top off system, like the Tunze Osmolator, will have multiple sensors and fail safes to prevent flooding. A good nano auto top off, like the AutoAqua Smart ATO micro, has all this in a tiny form factor that fits in an all-in-one nano. A kalkwasser reactor can be attached to an ATO to replenish Ca and Alk in a reef aquarium.
An aquarium doser, like a peristaltic dosing pump, delivers small amounts of fluid in timed intervals. The timer is tuned to deliver elements at the same rate they are depleted. A reef doser setup will often have at least three pumps (for Ca, Alk, Mg).