ProAqua PA-421 Spa Cartridge – Compatible with 4CH-21
- Diameter: 4-5/8 in
- Length: 7-7/8 in
- Top: Handle
- Case size: 28
ProAqua PA-421 Spa Cartridge – Compatible with 4CH-21 is backordered and will ship as soon as it is back in stock.
Pickup available at Piscine Hippocampe succursale
Usually ready in 24 hours
ProAqua PA-421 Spa Cartridge – Compatible with 4CH-21 is backordered and will ship as soon as it is back in stock.
Choose with confidence
The product in detail.
The ProAqua PA-421 cartridge replaces the filter in compatible spa or pool systems. The top handle makes removal easier during maintenance.
Compatibility: Choosing the Right Filter
Systems using the equivalent references below. Compare the length and connection with your current filter to confirm the size.
Specifications and Dimensions
- Diameter: 4 5/8 in
- Length: 7 7/8 in
- Top: handle
- Bottom: 1 1/2 in MPT connection
Equivalent References to Compare
- 4CH-21
- PDM25P4
- OC4-21
- PA-AP40191
- PTL18P-4
- FC-0121
Before purchasing, compare the part number, dimensions, and both ends with your current filter. An equivalent reference must also match your system’s configuration.
Maintenance and Replacement
Rinse the filter media regularly according to the manufacturer’s recommendations. For more thorough cleaning, use a cleaner suitable for spa filters. Replace the cartridge if it is damaged, deformed, or can no longer be cleaned effectively.
Need Help Choosing?
Email Piscine Hippocampe with the spa’s brand, model, year, and a photo of your filter showing its reference. You can also browse our spa replacement cartridges.
Useful details.
What dimensions are listed?
Length: 7-7/8 in
What reference number is listed for this product?
The Hippocampe council
The right product.
The right advice.
A question about compatibility, selection, or maintenance? Our team is here to support you before and after your purchase.
