Pool and Spa Check Valves
Does your spa drain down at night?
If your spa water level drops overnight or your fountain empties when the system is off, you’re almost always dealing with a worn‑out check valve. The check valve’s job is simple but critical: it keeps water from flowing backward through the plumbing when the pump shuts off.
When the internal rubber seal breaks down — which happens naturally over time — the valve can no longer hold water in place. That’s when you see:
Spa draining down to the pool
Water features emptying overnight
Air getting pulled into the system on startup
Inconsistent water levels
The good news?
It’s usually a simple repair.
Most check valve issues come from a failed flapper or deteriorated rubber seal and replacing that part restores proper water retention immediately.