Inspect your anode yearly, replace when half gone.

Yes, set a calendar reminder for once a year.

Saltwater pools are tougher on sacrificial anodes than freshwater — the higher conductivity makes the anode work harder. Check it annually. If it’s less than half the original size, swap it. That’s usually every 3 to 5 years, but your water chemistry and usage will change the timing.

How to check: find the anode (usually near the pump or heater), unscrew it, and look. If it looks like a chewed pencil stub, replace it. If it’s still chunky but has some pitting, it’s fine.

Don’t wait for a strict interval — inspect. A $20 anode is cheap insurance against corroding your heat exchanger or pump housing.