Product Information: Boospa is gradually replacing its Topology filter range with Cleonia filters, designed in-house. Depending on stock availability, you may receive either model. The delivered filter may differ slightly in terms of base color and label, but remains strictly identical in terms of reference, dimensions, and compatibility.
Compatible Filter 42513 / C-4326 / PRB25-IN / R173428
These filters are designed for a variety of spas, offering a practical and economical solution to maintain your spa water at optimal quality.
These filters are compatible with a wide range of renowned references and ensure efficient filtration.
Compatible References:
- Alina: F-325-M
- Allspares: AS-SPA060
- Boospa: A-000000-08223
- Claralys: CRB25
- Coast Spa: PRDC25
- Darlly: 42513
- Darlly EU: SC704
- Filbur: FC-2375
- Magnum/Gota Pure: RD25
- Pentair: R173428
- Pleatco: PRB25-IN
- Sunrise Spas: R9026107
- Topology: T-4326
- Unicel: C-4326
- Waterway: 817-2500
- Wellis: AKU1831
Advantages of a Set of Filters 42513 / C-4326 / PRB25-IN / R173428
- Versatility and Compatibility: These filters are suitable for a variety of renowned spa brands, offering a versatile solution for filtration needs.
- Filtration Efficiency: Thanks to their robust construction and classic filtration capacity, these filters maintain clean water for an impeccable spa experience.
- Durability and Reliability: Made with quality materials, these filters are designed to last, reducing the need for frequent replacements.
Dimensions:
- Outer Diameter: 127mm
- Length: 335mm
- Top: Opening of 54mm
- Bottom: Opening of 54mm
 |  |
| Top: Open | Bottom: Opening |
How to Maintain Filter 42513 / C-4326 / PRB25-IN / R173428?
- Regularly clean the filters for better filtration efficiency.
- Replace the filter every 3 to 6 months to maintain optimal water quality.
- Follow the manufacturer's instructions for proper maintenance of your spa.
Available Options

The filter is available in BlueWater filtration version. The material used in making this filter has been specially treated to provide antimicrobial action. The filtration capacity is thus enhanced for superior water quality compared to standard filters.
Frequently Asked Questions
My current filter is labeled PRB25-IN or C-4326: is this filter the equivalent?
Yes. If your current filter is labeled with any of these references - PRB25-IN (Pleatco), C-4326 (Unicel), 42513 (Darlly), R173428 (Pentair), FC-2375 (Filbur), or T-4326 - this filter is a direct equivalent. It is also compatible with Coast Spa, Sunrise Spas, Wellis, and Waterway brands. If in doubt, our selection guide can help.
How to ensure the dimensions 335 mm x 127 mm of the filter 42513 match my filter housing?
This filter measures 335 mm in length and 127 mm in outer diameter. Measure your current filter or housing on these two sides. If your values match, the substitution is direct. Both ends are open; ensure your housing accepts this configuration. For guidance on measuring, refer to our spa filter measuring guide.
What is the difference between the standard version and the BlueWater version of this Cleonia filter?
The standard version provides standard mechanical filtration. The BlueWater version incorporates enhanced antimicrobial action in the filter media, for more effectively treated water between cleanings. The dimensions remain the same (335 x 127 mm), as does compatibility. The choice depends on your usage: spa usage frequency and water quality sensitivity.
Is a specific product required to clean this 335 mm, 106 pleat filter?
With 106 pleats, rinsing with water alone is not sufficient: residues accumulate between the pleats, reducing efficiency. A dedicated spa filter cleaner is recommended to properly degrease and descale the media. Explore spa filter cleaning products.
How often should this individually sold filter be replaced?
Replacement frequency depends on spa usage, water quality, and cleaning regularity. Generally, a spa filter is replaced once or twice a year. This filter is sold individually, but there are also sets of 2 or 4 units of the same reference if you want to anticipate replacement or have a spare filter ready to install.
My Coast Spa is inactive due to filtration issues: can I receive the 42513 filter quickly if I order today?
If the 42513 filter is in stock, your order is shipped the same day for purchases made before 1 PM. Coast Spa is among the brands compatible with this reference. Before ordering, make sure your current filter is labeled 42513, C-4326, or PRB25-IN to confirm compatibility.
What should I do if the received 42513 filter does not match my spa?
A return is possible provided the filter is in its original, unopened, unused packaging. It can be done within 14 days of receipt. For industry professionals, it can be extended to 60 days. Before ordering, compare the references of your used filter (PRB25-IN, C-4326, 42513, or T-4326 - with those indicated on the product sheet. This reduces the risk of error and simplifies any return process.
What are the possible delivery methods?
Delivery depends on the product, your country, and your address. Depending on the order, shipping can be to your home or a pickup point. Exact options are displayed in your cart.
How can I track my package?
You will receive email notifications at various stages, with a tracking link or number upon shipment. You can also check your customer account.
What payment methods are accepted?
Payment can be made by credit card, PayPal, 4X PayPal, bank transfer, or check. For bank transfers, shipping occurs after funds are received.