I tried this and have to say that I ended up with a white elephant (Very heavy and rather bulky).
My unit was designed to take in dirty water and then strip it of sediment in one filtration process and then in a second process make it drinkable. For this I used a marine pump, a sediment filter and then a Katadyn ceramic filter. It also had a shower attachement.
One of the problems in such a system is the flow rates and pressure rates when moving from one size hose to another. Clearly you can pump water through a sediment filter far quicker than a Katadyn. This is problematic.
FYI my white elephant is gathering dust in the garage. I now use a Katadyn stirrup pump to purify large volumes of water and for showering I use a home-brew barrrel which sits on top of the roof rack and is connected to a shower rose. Simple and effective.
What I am saying is that it helps to be very clear about what your primary aim is with regard to building a pump. A clear design and probably some advice from a marine plumber / boat chandler would help.
Good luck
[This message has been edited by ctc (edited 04 February 2005).]
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