Step 10Additions
1. A water faucet instead of trying to remove a cap every time. (shown in picture below)
2. A pump the right priced one i found is a Wayne 1HP lawn sprinkler pump. They have it at a local store for $130
2a. Pressure tank to go with the pump so the pump doesn't have to work all the time
2aa. Pressure switch to turn the pump on and off
3. A point well or sometimes called a sand point well can be hit into the ground in case your barrels got low.
4. Larger pipe in case your pump has a 1" inlet or larger.
5. A water meter. Water Meter
6. Devise a way to have a float or line to see how much water you have left w/o looking into the barrel
7. Roof washer - i found about these recently and basically it takes away your first 10 - 14 gallons of water when it rains so that bird poop and other bacteria and dirt wash away for cleaner water.
8. If you go with a pressure tank, to add filters so the water is cleaner. (will be showing this later)
9. Hook it up to a toilet (will be showing this later)
10. Other ideas added here!
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http://www.amazon.com/gp/product/B0013KGO24/ref=s9k2a_c1_at4-rfc_g1?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-3&pf_rd_r=039RJTZD2CDTWGYD59VR&pf_rd_t=101&pf_rd_p=463383391&pf_rd_i=507846
It flows 132 GPH (just over 2 GPM) which is more than a lot of more expensive pumps available elsewhere.
One good idea is to use a a separate dedicated barrel and use a small pump and small copper pipe to make a floor heating system. You'll need to build a solar thermal hot water heater. On second thought, use an old hot water heater tank and hot water heater wrap to save the hot water during the day. You could easily make the system self contained. If you have the money, put a thermostat on it. Free whole house heating!
Anyway, thanks for posting the Instructable!
Oh, and about the filter. Use PVC, or aluminum if you want to (it'll heat the water), and make a pyramid shape that will fit snugly over the input (caulk it down, obviously) and another larger one for the output pipe. Wrap them in flexible filter material. Fit them snugly into place one over the other and put the pipe over the outer filter (you might want to cut a hole in the top to keep the debris from clogging it up) and viola, easy to clean filter.
Give me a minute and I'll post pics of what I'm talking about.