Rain Barrel to Toilet Installation
A Practical How-To Guide
Page 8
Extras
Congratulations!  You now have a working toilet that flushes with rain water.  Now you have another reason to look forward to gray and dreary skies.  Here's a few more gadgets you can add to your system.
Backflow Prevention
In some areas, it is required code for you to install a back-flow prevention device.  This eliminates the potential for untreated rain water to enter into your home's potable water supply.  The easiest low-cost way to do this is to install a garden hose vacuum breaker. 
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Garden Hose Vacuum Breaker
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9.  3/4" Male Hose to 3/4" Male Hose Adapter, Watts Industries, A-680, $2.69
10. 3/4" Garden Hose Vacuum Breaker, $3.97
11. 3/4" Female Hose to 3/4" Female Hose Adapter, Watts Industries, A-661, $4.19
Water Meter
How cool is it to know how much rain water you've used?  I bought a water meter from www.watermeters.com.  The model I have is DLJ SJ50. It was $79.95 plus $12 shipping. It seems to work okay except that it will only read about 1.1 gallons per flush.  After that, the last 0.5 gallon creeps in too slowly for the meter to register.
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