First off I am building an in wall tank so I am considering plumbing options.
1.. a sump
K your typical sump plumbed has a pump that sucks the water out of your sump and flows to your tank and an overflow/drain attached too your tank that drains the water into the sump. (understood)
The real question is how to achieve a drain point for a hard plumbed unit without a pump.
A waste water line ? can someone fill in the gaps on the attached image
plan b is add a pump

1.. a sump
K your typical sump plumbed has a pump that sucks the water out of your sump and flows to your tank and an overflow/drain attached too your tank that drains the water into the sump. (understood)
The real question is how to achieve a drain point for a hard plumbed unit without a pump.
A waste water line ? can someone fill in the gaps on the attached image
plan b is add a pump
