If your Culligan WH-S200-C clear sump keeps turning green, the cause may be light reaching the housing. The clear bowl is useful for inspection, but it can also let sunlight reach damp filter surfaces.
Why the Culligan WH-S200-C housing turns green
Green discoloration is most common when the filter is in a bright spot, near a window, or outside under partial cover. The more light that reaches the clear sump, the more likely visible growth becomes between filter changes.
How to fix the problem
- Replace the cartridge on schedule.
- Clean the sump during maintenance.
- Keep direct light off the housing.
- Use a removable fitted cover instead of a permanent wrap.
Use the WH-S200-C cover
If your model is Culligan WH-S200-C, the Culligan WH-S200-C water filter cover is made for that housing. It blocks light from the clear sump while staying removable for cartridge changes.
If your Culligan model is WH-HD200-C instead, use the Culligan WH-HD200-C water filter cover.
For the full explanation of the cause, read why there is green algae in a whole house water filter. For a step-by-step prevention guide, see how to stop algae growth in a clear water filter housing.
FAQ
Is this the same as the Culligan WH-HD200-C?
No. The WH-S200-C and WH-HD200-C are different housings. Use the cover that matches the model number on your system.
Will a cover make it hard to change the filter?
No. A removable cover can be taken off during maintenance and put back afterward.
Should I clean the housing before using a cover?
Yes. If the housing is already green, service it according to the manufacturer's directions before covering it again.
Does blocking sunlight help right away?
It removes one major condition that contributes to visible green growth. Regular cartridge replacement and cleaning still matter.