Product Information: Boospa is gradually replacing its range of Topology filters with Cleonia filters, designed by us. Depending on stock availability, you may receive either model. The filter delivered may therefore differ slightly in terms of the base color and label, but remains strictly identical in terms of reference, dimensions, and compatibility.
Compatible Filter 42513 / C-4326 / PRB25-IN / R173428
Replaces this spa filter reference (50251 / C-5625 / PJ25IN / FC-1425)
These filters are designed for a variety of spas, offering a convenient and economical solution to maintain your spa water at optimal quality. These filters are compatible with a wide range of renowned references and ensure effective 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.
- 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 the 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 the manufacturing of this filter has been specially treated to provide antimicrobial action. The filtration capacity is thus enhanced for superior water quality compared to that filtered by a standard filter.
Frequently Asked Questions
If my current filter has the reference PRB25-IN or C-4326: is this filter the equivalent?
Yes. If your current filter has one of these references - PRB25-IN (Pleatco), C-4326 (Unicel), 42513 (Darlly), R173428 (Pentair), FC-2375 (Filbur), or T-4326 - this filter is the direct equivalent. It is also compatible with Coast Spa, Sunrise Spas, Wellis, and Waterway brands. If in doubt, our selection guide can assist you.
How to verify that the dimensions 335 mm x 127 mm of the filter 42513 correspond to 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, so verify that your housing accepts this type of configuration. To be guided in your measurement, consult our spa filter measurement 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 well as compatibility. The choice depends on your usage: spa usage frequency and water quality sensitivity.
Is a specific product needed to clean this 335 mm, 106 pleat filter?
With 106 pleats, rinsing with water alone is not sufficient: residues accumulate between the pleats and reduce efficiency. A dedicated spa filter cleaner is recommended to properly degrease and descale the media. Discover the spa filter cleaning products.
How often should this single filter be replaced?
Replacement frequency depends on spa usage, water quality, and regularity of cleaning. 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 wish 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 will be shipped the same day for any purchase made before 1 pm. Coast Spa is among the brands compatible with this reference. Prior to ordering, ensure that your current filter bears the reference 42513, C-4326, or PRB25-IN to confirm compatibility.
What to do if the received 42513 filter does not match my spa?
A return is possible provided that the filter is in its original, unopened, and unused packaging. It can be done within 14 days after receipt. For industry professionals, this period 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 address. Depending on the order, shipping can be done to your home or a pickup point. The exact options will be displayed in your cart.
How can I track my package?
You will receive email notifications at different stages, with a tracking link or number at 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 a bank transfer, shipping will occur after funds are received.