This stock tank pond is fed by the waste water reject line of a reverse osmosis membrane. This is highly filtered water that is low, but not zero, TDS (total dissolved solids). Instead of wasting the water directly to ground, we turn it into another habitat. The next steps are adding plants and mosquitofish.

Top down view from the porch

The black line at the top is the reject line for the RO membrane. It drains in the pond.

The filter is a block of 20ppi Poret slipped over a length of drilled and capped PVC.