How can you tell if your uv sterilizer is working in your pond?

Check the lamp: If the lamp is not glowing, it may be a sign that the lamp is bad, the ballast (transformer) is bad, or there is an electrical problem.

Check the ballast: If the lamp is not burning and it's not an old lamp, the ballast (transformer) may be bad. Be careful not to break it, as it's one of the more expensive parts of the unit.

Check the sleeve: Cleaning the sleeve can make a big difference in pond clarity. Make sure it's not clogged or dirty.

Check the pump intake: Ensure the pump intake is not near the water return point or waterfall, as this can reduce circulation and filtration.

Check the UV lamp: Depending on the type of UV lamp you have, you can easily check if it's working by looking for a glow or using a UV tester.

Wait for results: It may take up to 24 hours to see the physical effect of the sterilizer, and up to 48 hours to complete its work if you're using it to clear green ponds.

Monitor water clarity: A properly installed and designed UV sterilizer can help maintain clear water in your pond or aquarium.