Finally, I decided it was time to upgrade to a fail-proof and reliable top-off system. Three ATO's that I considered were the Tunze Osmolator, the Elos Osmocontroller and the Innovative Marine HydroFill. After much consideration, I decided to go with the IM HydroFill. Although it was the most costly, $199 for the controller and $99 for the pump, it also seemed the most durable and the most reliable.
Installation was extremely easy and only took about 20 minutes. It took so long only because I had to remove the old top-off system and was watching Miss Hong Kong on TV while installing the top-off. lol... Simply mount the two sensors at your desired levels (it does not matter which sensor is high and which sensor is low), clip the pump to the side of your reservoir, mount the HydroFill module somewhere in your stand, connect all the tubing and plug everything in. It is just about as simple as it can get. Kudos for Innovative Marine for making it so easy!
With the new top-off system in place, I can now sleep easier at night and no longer have to worry about snails in my refugium/sump getting to the float or worry about the float failing or getting stuck. I definitely would not hesitate to recommend the Innovative Marine HydroFill to anyone else looking for a high-quality, dependable top-off.