4.2" × 3.1"
Bestway spa filters
Bestway makes the Lay-Z-Spa and SaluSpa inflatable hot tubs, and most of them use the same small spa filter: the Bestway Type VI cartridge. Bestway's US site lists the Type VI at about 4.2" across and 3.1" tall for its SaluSpa line, and the Lay-Z-Spa UK site sells it as compatible with every Lay-Z-Spa hot tub except the Monte Carlo, which uses a separate rigid-spa cartridge. Retail listings for the Bestway two-pack carry the part number 58323 (58323E in the US); Bestway's own 2021 and 2025 Lay-Z-Spa catalogs number the same cartridge 60311, and its 2013 manual printed it as 58239 (VI).
Bestway's cartridges are not in the Unicel, Pleatco or Filbur catalogs we use for the rest of this site, so there is no catalog cross-reference to show. The size and fitment on the Type VI page come from Bestway's own pages, catalogs and manuals, and the 58323 number from a major retailer's listing for the Bestway product; each source is linked so you can check it. Which cartridge each model and year takes, including the Monte Carlo and the older 58094, is on the Bestway filter by model and year page.
Inflatable hot tub filters are small and work hard. The pump in a Lay-Z-Spa or SaluSpa moves far less water than a hardshell spa pump, so a clogged cartridge quickly shows up as weak water flow and cloudy water. Rinse the hot tub filter every day or two while the spa is in use, swap it for a fresh one when the pleats stay discoloured after cleaning, and keep a spare so you are never running the spa without one.
If your spa is a Monte Carlo, or you are not sure which Bestway model you own, check the label on the pump unit or the manual before ordering, and compare the old cartridge against the 4.2" x 3.1" size on the Type VI page.
This page lists 1 Bestway replacement cartridge from manufacturer and retailer pages, plus model and model-year fitment for 1 of them (8 hot tub models in total). Find your spa filter by the OEM part number on the end cap, or measure it and compare sizes below.
Clean and replace intervals for one cartridge on this list, plus the cross-reference numbers and a buy link: filter replacement schedule and reorder.
| Cartridge | Unicel | Pleatco | Filbur | Size | Fits | Status |
|---|---|---|---|---|---|---|
| 58323; 58323E | not listed | not listed | not listed | 4.2" (107 mm) × 3.1" (79 mm) | 8 models | verified |
Know your model but not the part number? See Bestway filter by model and year.
Guides that apply to Bestway
- Bestway Type VI and Lay-Z-Spa filters
- Open-end vs threaded hot tub filters
- How Filbur, Unicel and Pleatco numbers compare
- How to find your spa filter size
- How to install a cartridge
- All guides
Search Bestway part numbers on Amazon
Each button opens an Amazon search for that part number. The cartridge page is where the cited size and fittings are. Match those before you buy.
Part numbers from this table
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Type VI cartridge (Bestway 58323)
Disclosure: we may earn a commission from qualifying purchases made through retailer links on this site, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Amazon links on this page go to Amazon.com and are affiliate links; they never change what we write, and the list is not ranked by commission. Each “Search on Amazon” button opens an Amazon search for the part or product name shown, not a single listing we pre-checked. Check size, quantity and your spa maker’s guidance before you buy. See our affiliate disclosure.
Model-year fitment comes only from the sources named on each cartridge page. Where no source lists models or years, the page says so.