OK lets think about this for a minute, do most people actually use 30 gallons a day? Yes many will make up 30 gallons or more on occasion for water changes but we don't have to. It wouldn't much harder to fill a storage container over a few days rather than all at once. Also the introduction of a booster pump makes it possible to lower the ratio of waste water. So if one could adjust their water usage to about 10 gallons a day you might only be looking at around 20-30 gallons of waste.
Personally I'd be good with a gallon a day for water changes (~7 gal/week wc) and around 5 gallons a day for top off (overkill, probably less) so I'd say 10 gal/day is above average but a a good safe number.
The other question I have is what happens at the water heater? Will water be pushed back into the cold supply or will it drain out? I'm no expert on this.
Remember the idea is also to improve on whats available so just because what is already out there doesn't really work for you doesn't mean the idea is dead or hopeless. There are other purposes to DIY than saving money.
Any ideas?
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