Hot Tub Replacement Filter Cartridges Compatible with RELXTIME & More

Our review of these hot tub replacement filter cartridges looks at who will benefit most and why they work as a routine maintenance item. These screw-in cartridges are aimed at owners of inflatable spas and massage pools who want an easy, reliable replacement that fits common RELXTIME-style filter housings; the single biggest reason to buy is consistent water clarity thanks to the trilobal fabric technology that traps fine dirt and oils while preserving flow. They arrive as an 8 pack, making scheduled swaps straightforward and reducing downtime for regular spa use.

Key Features

• Perfect Compatibility: Designed to fit RELXTIME and similar inflatable hot tub models, so replacing a worn cartridge is quick and predictable.
• Trilobal Fabric Technology: The 3D pleated fabric catches smaller particles, oils and debris more effectively than standard filter paper while allowing good water throughput.
• Screw-in Design: The screw-on top and closed bottom end cap style make installation simple and reduce the chance of misalignment during swaps.
• Pro-Grade Dimensions: With an outer diameter of 3.9 in, inner diameter of 2.4 in and height of 3.1 in, these cartridges match common spa filter chambers for reliable performance.
• Maintenance Rhythm: Supplied in an 8 pack so owners can follow the recommended two-week replacement cadence without repeated ordering.

Who It's For

This replacement pack is best for owners of inflatable hot tubs or small massage pools who already use or need RELXTIME-compatible screw-in cartridges and who prioritize easy swaps and clearer water. Families or frequent users who want to minimize cloudy water episodes will appreciate the 8-pack quantity and the trilobal pleat design that retains oils and fine debris.

It is less appropriate for owners of large built-in spa systems that use proprietary or non-screw-in filter formats, or for buyers seeking washable permanent cartridges; this product is intended as a disposable replacement cartridge to be replaced every couple of weeks for optimal filtration.

Pros & Cons

Pros

• Consistent fit with RELXTIME-style filter housings makes replacement straightforward.
• Trilobal pleated fabric improves capture of fine particles and oils compared with basic paper filters.
• Eight cartridges per pack support recommended maintenance intervals without frequent reordering.

Cons

• Designed as a replaceable cartridge rather than a washable permanent filter, so ongoing purchases are required.

Specifications

Brand	vkolim
Pack Quantity	8 pack
Outer Diameter	3.9 in
Inner Diameter	2.4 in
Height	3.1 in
End Cap Style	Open top / Closed bottom

Our Verdict

These screw-in replacement cartridges are a practical, cost-effective choice for inflatable spa owners seeking reliable filtration and easy maintenance; the trilobal fabric captures oils and fine debris while dimensions and screw-in caps match common RELXTIME-style housings, making them good value for routine two-week replacements.

Frequently Asked Questions

Are these filters compatible with RELXTIME inflatable hot tubs?
Yes, they are designed to be compatible with RELXTIME-style screw-in filter housings and similar inflatable spa models.

How often should the cartridges be replaced?
It is recommended to replace the cartridges every two weeks to maintain optimal water clarity and spa performance.

Can these filters be washed and reused?
They are intended as replaceable cartridges; while light rinsing can extend short-term life, they are sold as disposable replacements for best results.