The Pool -
Concrete bowl, fiberglass panel sides
20x40 oval shaped in ground. 3' shallow, 10' deep.
Two jet returns fed from one line
One working skimmer, one dead skimmer
Bottom Drain
DE Filter
The problem -
Loses water all summer long.
Each fall we drain down to first step and leave for summer. Last two years it self drained over a period of six years passed the walls exposing the first few inches of the bowl.
Other symptoms.
If we pull from drain (and not skimmer) we lose A LOT less water.
The returns are spitting out a fine, pale (tan) sandlike substance that collects near the spray pattern.
Also, sizeable cracks and even some concrete missing in the shallow end of the bowl. Though the water stops draining before it gets to these.