Sink Positively and Save Water

by Cristina Foung

My favorite green product of the week: Environmental Designworks Sink Positive Toilet Tank Lid

What is it?
The manufacturer calls it a “multi-purpose accessory sink.” But basically it’s this fabulous direct greywater system. It’s a toilet tank lid that’s also a sink. It allows you to take the clean water that usually goes to fill your toilet tank, wash your hands with it first, and then use that to flush the toilet the next time around. You connect the sink to the water supply line in your toilet tank and then each time you flush, the water first comes out the faucet and then drains into the toilet tank.

Why is it better?
Greywater recycling in general allows for great amounts of water to be used for multiple purposes. In this world of increasing freshwater scarcity, that kind of conservation is a good thing (thank you, Captain Obvious).

The average single family home uses about 11 gallons of water from faucets daily. Let’s say just a quarter of that goes to hand washing post-bathroom use. With a Sink Positive, you would be cutting out that faucet use. It allows access to the clean tap water which normally goes straight into your toilet bowl. In all, that might save you 1,000 gallons of water a year.

But there are other benefits too. Each time you flush, that water is going to be there, allowing you to wash your hands. There’s no “accidental forgetting.” So you stay cleaner and less germy. Also, the water automatically stops running after the toilet tank runs its normal filling course. That means you don’t have to touch any faucet handles afterwards (even better for germaphobes).

And they save space! Take my apartment for example…we have a split bath. In the toilet room, there’s no sink (it’s in with the shower). But if my roommate is showering, oh no! Where do I wash my hands? Sink Positive is here to save the day. (Note: I don’t actually have one yet but I do plan on getting one as a housewarming gift for my brother as his place is set up the same way. Shhh…don’t tell. It’s a surprise.)

Where can you find it?
You can order the Sink Positive (either in Standard or Deluxe) directly from the Sink Positive website. The Standard model costs $89 and the Deluxe costs $109 (plus $10.95 S&H).

Besides her green products column on Cleantech Blog, Cristina is a passionate advocate for green living at the Green Home Huddle at, which focuses on electric cars, energy efficient appliances, and other green products.

3 replies
  1. h2oknow
    h2oknow says:

    Great review! I bought one of these from Real Goods and I love it. You made one big mistake in your review, though. The used water drains into the BOWL not the tank. It uses the bowl refill water supply to operate and does create a small gray water system. It's a great green addition and fun gizmo for guests. I love it!

  2. zaraward
    zaraward says:

    Nowadays, more and more people are becoming eco-conscious and are finding more and more ways to go green. Modifying how sources are used has the positive effect of not only preserving cash, but assisting the surroundings.
    There are many water preserving gadgets available. Eco bathrooms in particular are being designed using quite a wide range of modern water preserving thoughts. One of the most well-known of these is the double cleanse rest room. These Eco bathrooms have been around for decades, but have become more well-known in the Combined Declares since the release of the government law mandating low water bathrooms in the 90's. The double cleanse rest room allows the individual two choices: a half cleanse of 1.6 gallons for fluids only, and a full cleanse of 3.5 gallons for eliminating strong spend.

  3. zaraward
    zaraward says:

    You have mentioned the important factor, which is nowadays considered as the main concern among the people. This is a one kind of multiple use sink. I like it, thanks for sharing with us this article.

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