Your UV system needs good water to operate effectively.

If your water is 'bad' you need to put in some pre treatment:

  • a water softenor
  • a sand filter or silt bag
  • gutter flush systetms and or a 'Raincatcher' in the top of your tank

If the problem is staining this could be from clay which has sub micron particles that pass straight through your finest filter cartridge.

Tanks can hold very fine particles in suspension, and may need to be emptied. A floculant can be added to drop out these particles.