Gravity aided Catchment tank?

[mella l]

Thanks all and thanks Maud, I understand that a pump of some type will be needed after all, and a solar powered pump is intriguing. When I was contemplating this, I seem to have forgotten that in the prairies lands of old a wind mill provided this pumping power, much like a hand pump on a deep well does for underground water supply! Duh. [:I] But thanks to all for the food for thought, I love all the different takes on this, group pondering as it were! Mahalos plenty!

mella l

[Les C]

Does anyone know if treatment systems need a minimum amount of pressure/flow to work properly? In other words, could gravity feed not supply adequate pressure to move water through a UV treatment canister for proper treatment?

[gtill]

John, the on demand I mean is a seperate system with a pump only, such as in rvs and boats, and then only to the dishwasher, drip system, and elevated tank. In this system a faucet activates the pump via a low volt wire to a pump switch while manually turning on the washer. The drip and exterior hose bib could do the same either by a faucet/switch or a timer. Likewise the float valve/switch for the gravity tank. These would all be off one full 1" pipe plumbed to your 20'cargo container, lined, as a holding tank. All the indoor plumbing would be from the upper 300 gallon tank via a 1" minimum pipe. Gravity tank would be topped up every 25 gallons or so, should take 5 minutes with 110 or 10 by battery. Low pressure but good steady volume. I believe it would do well with a uv light filter. See problems? Please fire away.