We've had the HydroRight sample unit for ages now after meeting with the representatives at the Home and Housewares show months back. We were in the process of moving to a new apartment and didn't want to install it to test only then having to remove it upon moving, but we've finally settled in and found the time to see if the dual flush toilet add-on worked as promised.
The HydroRight doesn't require any real handyman skills, which makes this a very viable renter's solution. We had the whole system installed in about 10 minutes by following the instructions and didn't have any problems during the process. Installation is comprised of unscrewing this and attaching that, and then next thing you know, you have the ability to do what Europeans have enjoyed for years now: dual flush action.
Liquids can be flushed with a low-flush setting, while more serious business is handled by a solids flush button. Over time, using this dual flush setup can save up to 70% of your daily toilet water consumption. That's plenty of gallons that could be used more efficiently if and only when needed.
A couple things to note: the HydroRight is big and plasticky. It just barely fit into our toilet and there are some parts which seem a little toy-like in construction. But so far, so good, without any leaks and the toilet flushes well (we have to hold it for a little longer than we were previously used to using the traditional lever) and at under $20 at Amazon, the conversion kit seems like a water wise no brainer for those money and water conservation minded. And we have to admit, pressing a button is a lot more fun than pressing an old fashion lever. Now if it only supported single or dual finger-swiping gesture to determine whether to flush for number one or two (we jest...kind of).