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How to Use Graywater in Toilet Tanks

This Old House plumbing and heating expert Richard Trethewey discusses the benefits of a combination toilet/sink fixture

In this video, This Old House plumbing and heating expert Richard Trethewey discusses the benefits of a combination toilet/sink fixture.

Steps:

  1. To replace existing toilet, start by turning off the water at the shut-off valve located behind the toilet.
  2. Flush the toilet and hold down the handle to drain the toilet tank.
  3. Sop up the remaining water from the toilet bowl with a large sponge.
  4. Use a wrench to disconnect the water-supply line from the underside of the toilet tank.
  5. Pull off the plastic caps concealing the closet nuts on the sides of the toilet base. Remove the nuts with a wrench.
  6. Rock the toilet back and forth to break its bond with the wax gasket.
  7. Carefully lift up the toilet and carry it from the bathroom.
  8. Use a putty knife to scrape any remaining wax from the closet flange (toilet drain).
  9. Press a new wax gasket onto the closet flange, then set the combination toilet/sink on top of the gasket.
  10. Push down on the toilet with all your weight to compress the wax gasket. Then alternately tighten the nuts onto the closet bolts. Repeat until the toilet is fully seated.
  11. Reconnect the water-supply line and turn on the shut-off valve.
  12. To install a retrofit sink kit to an existing toilet, begin by removing the lid from the top of the toilet tank.
  13. Remove the refill tube from the toilet.
  14. Connect the water-supply line for the sink to the fill valve inside the toilet.
  15. Insert the sink's drain line into the toilet's discharge tube.
  16. Set the retrofit sink on top of the toilet tank. Use the included spacer, if necessary, to adjust the sink to fit the length of the tank.