[Here's a guest review from my brother Andrew Davidson]:

The TwoFlush from Aquanotion is a dual flush conversion kit for standard North-American style toilets. It can potentially save hundreds of liters of water by providing a choice between a full flush and a low-flow option every time you flush. TwoFlush is a Canadian company based in High River (just south of Calgary), Alberta, Canada.

First some toilet history. Back in the good ol' days toilets used 20L (5 gal.) per flush, then, for a time, "low flush" 13L (3.5 gal.) became the North American standard. Today a new toilet must flush with 6L (1.6 gal.), we are now in the ultra-low flush era. The TwoFlush can be installed on any of these toilets - the full flush will remain the original capacity of the toilet, and the half flush can be adjusted to ensure that the bowl is cleared. If you have an older toilet with a larger tank, the TwoFlush will reduce your water usage without the need to replace the toilet, but to save the most water, you still have to replace your toilet with a new 6L/3L dual flush model.

The TwoFlush kit replaces some of the parts in your toilet tank, including the flapper valve and flush handle. The basic parts of the TwoFlush are the valve tower:

and the handle assembly. Note the two nested handles, the smaller one for a half-flush and the larger one (which also rotates the smaller one) for a full flush:

Also included are instructions, a large foam ring (for sealing between the tank and bowl) and some adapters so that the handle fits in different sized holes depending on the handle hole on your tank. What is recommended, and not included are new brass tank tie-down bolts -- it seems like these should be included, but they can be easily picked up at any hardware store for a couple of dollars.

Installation requires complete removal of the tank from the bowl, replacement of the flapper valve, and handle assembly, and re-installation of the toilet tank. This is more than a simple flapper valve replacement, but less than installing a new toilet.

Here's a picture of the top of my toilet tank with the old flapper valve and handle. Unfortunately my tank does not have a flat front (see how it curves in just to the right of the handle and then back out further to the right), and is not compatible with the TwoFlush!

The TwoFlush requires that your toilet tank have a flat front, which is unfortunately not listed as a requirement in the FAQ on the TwoFlush website, but is mentioned in the included instructions. The other requirements are that your toilet handle be in the left upper corner of the front of the tank, and that the tank dimensions be at least 13" tall, 16" wide and 6" deep, and that the toilet be a two-piece model (i.e. separable bowl and tank).

It's too bad I haven't been able to install the TwoFlush on the most used toilet in my home but I may have more success putting it downstairs. For upstairs perhaps I should consider another TwoFlush product, the Class-on dual flush 9L/3.8L replacement tank, which replaces the entire tank:

Visit DualFlushToilet.net for more information on the TwoFlush retrofit kit and Class-on replacement tank.

[Thanks for that review Andrew - I'll post an update when he finally gets this thing installed]

How do you save water in the bathroom? let us know in the comments!

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What are your favorite eco-friendly films of all time? Let us know in the comments!

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