RDspaguy
In The Industry
That is because your valve is leaking. When the pump is on, water goes out. When the pump is off, air goes in and water goes back to the pool. Fix the valve and your pump will remain full.
This fixing via the internet stuff is tough
A new question on my pool... the old pool company had listed my pool as gunite/marcite. How can I tell what my liner is and then should I really buy a stainless steel brush? I'm very nervous to damage the pool. Thank you!