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Shower Flow Meter

Most water usage requires a fixed amount of water; washing machines, dishwashers, toilets, etc. The one place we have discretionary water use is the shower. Unfortunately, most of us (including myself) have no idea of how many gallons of water a shower takes. In order to help reduce my water usage I decided to put together a shower flow meter. I repurposed a garden flow meter and added the required fittings to make it attach to a (US) standard shower fixture.

I used a RainWave Digital Flow Meter (about $16 on Amazon) 
The Rainwave flow meter automaticly turns on when the water flows and powers off after a few minutes of inactivity. The two sets of numbers displayed are total gallons used and gallons used this session with .1 gallon resolution. The flow meter can display water useage in Gallons or Liters.

Added some brass fittings to convert the Garden Hose Thread (GHT) fittings on the flow meter to 1/2" plumbing threads to match up with my shower (feed) arm and low flow shower head.

The four brass adapters are, from left to right:
1/2" Male to Male
1/2" Female to Garden Hose Thread (GHT) Female
GHT Male to 1/2" Male
1/2" female to 1/2" Female