1. Setup and Installation
Proper installation ensures optimal filter performance and clean spa water. Follow these steps carefully:
- Turn off the spa power: Always ensure the spa's power supply is completely disconnected before handling any components.
- Remove skimmer/basket & clear debris: Locate and remove the skimmer basket. Empty any collected debris.
- Take out the old filter: Carefully remove the existing filter cartridge from its housing.
- Insert new filter & replace skimmer/basket: Place the new POOLPURE PLFPRB25-IN filter into the housing, ensuring it seats correctly. Reinstall the skimmer basket.

2. Operating Instructions
Once the filter is installed, restore power to your spa. The filter will begin to operate automatically, continuously filtering your spa water. Monitor water clarity and flow rate regularly to ensure proper function.
3. Maintenance
Regular cleaning and timely replacement of your filter cartridge are crucial for maintaining clean and healthy spa water.
Filter Cleaning
To prolong the service life of the filter, we recommend cleaning it once a month. Follow these steps:
- Use a garden hose with a straight flow nozzle to wash the filter element.
- Work from the top to the bottom, holding the nozzle at a 45-degree angle.
- Wash all the pleats as well as between the pleats.
- Rinse until all dirt and debris is gone.

Filter Replacement
The filter should be replaced depending on usage. A good indicator for replacement is when cleaning no longer restores adequate water flow or clarity.
4. Troubleshooting
- Reduced Water Flow: Check if the filter is clogged. Clean the filter thoroughly. If flow does not improve, consider replacing the filter.
- Cloudy Water: Ensure the filter is correctly installed and seated. Clean the filter. If the problem persists, check spa chemical balance or replace the filter.
- Filter Damage: Inspect the filter for tears, cracks, or excessive wear. Replace damaged filters immediately to prevent debris from entering the spa system.
5. Specifications
The POOLPURE PLFPRB25-IN filter is designed for efficient hot tub filtration.
- Length: 13 5/16 inches
- Outside Diameter: 5 inches
- Top Hole: 2 1/8 inches
- Bottom Hole: 2 1/8 inches
- Filtration Area: 25 Sq.ft
- Filter Material: Trilobal Filtration Fabric (4 oz. thickened polyester)
- End Caps: Reinforced ABS
- Certification: NSF/ANSI 50 Certified Safety by IAPMO
Compatible Models
This filter is compatible with the following models:
- PRB25-IN
- Unicel C-4326
- Filbur FC-2375, FC-2370
- SD-00196
- 303909
- M-4326
- 8172500
- R173429

6. Warranty
POOLPURE provides a 90-day warranty from the date of purchase for this product.
7. Support
For further assistance, technical support, or warranty claims, please contact POOLPURE customer service through the retailer where the product was purchased or visit the official POOLPURE website.