Automatic water changer  
Bottom (inlet) of the carbon filter.  Note that the water flows UP so that gravity will keep the carbon together.  I was worried about it settling and a gap/tunnel making its way along the top of the pipe if it was laying on its side, allowing the chlorine/chloramine to bypass it.

The end cap is a female inspection adapter, with a male 2-inch screw-in plug.  I drilled a hole in the plug and tapped it with a 3/4 inch pipe thread tap.  Then I screwed in a 3/4 -> 1/2 inch reducing adapter with a mixture of solvent on its thread to make sure that it bonded well and there were no leaks.  Turns out this was the most water-tight part of the entire project....

Bottom (inlet) of the carbon filter. Note that the water flows UP so that gravity will keep the carbon together. I was worried about it settling and a gap/tunnel making its way along the top of the pipe if it was laying on its side, allowing the chlorine/chloramine to bypass it.

The end cap is a female inspection adapter, with a male 2-inch screw-in plug. I drilled a hole in the plug and tapped it with a 3/4 inch pipe thread tap. Then I screwed in a 3/4 -> 1/2 inch reducing adapter with a mixture of solvent on its thread to make sure that it bonded well and there were no leaks. Turns out this was the most water-tight part of the entire project....


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