Can you use Greywater to flush your toilets?

That depends on the type of toilet that you have, but more importantly, you should ask yourself if this is really the best way to use greywater.  The problem with greywater is that it is not just water, but is filled with many things like lint, hair, soap, skin cells, dirt, and anything that you wash off your body or your clothes if you use the clothes washer water as well.  Now, most plants like all this stuff as it provides nutrients that decompose into the soil.  The problem with using it in you toilet is that it tends to gum up the mechanisms that make the toilets function.  If you have a pressure assisted toilet, there are multiple problems:  first, using greywater on a pressure assisted toilet invalidates the warranty; Secondly, the water must be pressurized by a pump in order for the Pressure Assisted toilets to function properly, meaning the pump would have to maintain that pressure 24/7, not typical of sump pumps that are most commonly used to pump greywater because they have a certain tolerance for the greywater debris I talked about earlier; and lastly, greywater cannot be stored  for more than 24 hours, without being purified, or it turns into blackwater, which is raw sewage.  There are some commercial systems that do this, like the BRAC systems, but these require a significant amount of energy for the pumps and use potable water to backflush the filters on a weekly basis.   Maybe sending it outside in Anchorage isn’t such a good idea in the dead of winter and something like the BRAC system would be worth the cost($1,800 plus installation), but down here in California, it just doesn’t make economic sense.  Good Luck,

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