Low flow, poor suction; bubbles in pump & pool, mustard algae

[PoolDoc]

The valve cover is installed incorrectly.

Good catch, Mark.

[Marin]

That was a nice catch.

Question on this topic, one I've wondered about recently. Will an underground suction leak provide enough air? I suppose it depends on soil composition. Rocky/sandy could, dirt/clay might not. Mostly dirt around here, I assumed that an underground suction leak would draw in and show mud. Any ideas?

[PoolDoc]

As you say, it depends on soil conditions . . .