Hot Tub Replacement Filter Cartridges - Compatible Screw-in 12 Pack

In this review the reviewer tested the 12-pack of vkolim Hot Tub Replacement Filter Cartridges to see whether they offer an easy, affordable way to keep inflatable spas clear. The bottom line: these screw-in cartridges are best for owners of compatible RELXTIME, ALEKO, Wejoy and similar inflatable hot tubs who need a reliable, repeatable replacement that fits and filters well. The most convincing benefit observed was the trilobal fabric pleated design, which trapped visible debris while allowing strong water flow, so pumps did not strain during normal filtration cycles.

Key Features

• Perfect compatibility: Designed to match the screw-in connection used by many RELXTIME and like-model inflatable hot tubs, so replacements fit without modification.
• Trilobal fabric technology: The 3D pleated material captures fine dirt, oils and debris while keeping water flow high for effective circulation.
• Pro-grade dimensions: With an outer diameter of 3.9 in, inner diameter of 2.4 in and height of 3.1 in, the cartridge matches common spa filter housings.
• Top and bottom end cap design: Open top and closed bottom end caps make the cartridge simple to screw into place and seal correctly in typical spa fittings.
• Long-lasting clean: Outperforms basic filter paper so owners spend less time replacing filters and more time enjoying the spa.
• Hassle-free guarantee: The seller promises responsive support within 24 hours for order problems, which eases post-purchase concerns.

Who It's For

This pack is ideal for owners of inflatable hot tubs and small massage pools who need multiple replacements at once, such as families or rental properties that rotate cartridges frequently. It also suits users who prefer screw-in style cartridges and want material that catches fine particles without choking off flow.

Those with uniquely sized or proprietary cartridge housings should verify the 3.9 in outer diameter, 2.4 in inner diameter and 3.1 in height before buying; customers seeking permanent, hard-plumbed commercial filters may need a different heavy-duty option.

Pros & Cons

Pros

• Consistent fit reported by multiple owners, so replacements are straightforward to install.
• The trilobal pleated fabric traps oils and fine debris effectively while keeping flow high.
• Sold as a 12-pack, which reduces frequency of ordering and is cost-effective for regular maintenance.
• Responsive customer support promise reduces risk of ordering issues.

Cons

• Needs replacement about every two weeks for best performance, which is frequent for some owners.
• Compatibility listed using manufacturer names for reference only, so buyers must still confirm fit with their model.

Specifications

Brand	vkolim
Cartridge count	12 pack
Outer diameter	3.9 in
Inner diameter	2.4 in
Height	3.1 in
End cap style	Open top, closed bottom

Our Verdict

The vkolim 12-pack replacement cartridges are a practical, value-driven choice for owners of RELXTIME and similar inflatable hot tubs who need dependable screw-in filters. Their trilobal fabric balances fine-particle capture and water flow, and the included support promise makes repeat purchases low risk, so they represent good value for routine spa maintenance.

Frequently Asked Questions

Will these fit my RELXTIME inflatable hot tub?
They are designed for RELXTIME and similar models, but you should confirm the cartridge dimensions of 3.9 in outer diameter, 2.4 in inner diameter and 3.1 in height against your unit.

How often should I replace the cartridges?
Replacement is recommended about every two weeks to maintain optimal water clarity and pump performance under typical use.

Do they reduce water flow when new?
The trilobal fabric is engineered to trap debris while maintaining high flow, so pumps generally do not experience increased strain when filters are fresh.