Caldera 33016 Filter Cartridge
Caldera OEM number • 50 sq ft • 7″ OD × 10.75″ long
33016 is Caldera's number for this cartridge, not a part you have to buy from Caldera. The filter itself is a 50 square foot cartridge measuring 7 inches across and 10.75 inches long, and Pleatco, Unicel, and Filbur all build it. If you read 33016 off an old cartridge or found it in your manual, any of the numbers below drops into the same housing.
Fitment notes
Swivel handle top, 2-inch male slip fitting on the bottom. This is the original style Caldera 50, superseded by the PCD50N, which drops the slip fitting for a plain 2-2/3 inch opening. Unicel states its C-7350 (the PCD50N equivalent) can be used as a replacement for this cartridge. Pleatco's sheet gives the length as 10-9/16 inches against Unicel's 10-3/4.
What to buy instead
Replacements for the Caldera 33016
Each button searches Amazon for one of the numbers this cartridge is sold under. The OEM version is usually the most expensive of the set and the aftermarket versions are the same physical filter, so it is worth checking all of them before you order.
Every number for this filter
| Brand | Part Number | Type |
|---|---|---|
| Caldera | 33016 | The number you searched |
| Pleatco | PCD50 | Aftermarket equivalent |
| Unicel | C-7451 | Aftermarket equivalent |
| Filbur | FC-3084 | Aftermarket equivalent |
Full specs, the cartridge diagram, and the complete compatibility list live on the PCD50 cartridge page. You can also see every 7″ × 10.75″ cartridge if you are checking a measurement rather than a part number.
Frequently Asked Questions
What filter replaces the Caldera 33016?
The PCD50 replaces it directly, and so does every cross-reference for it: C-7451, FC-3084. All of them are the same 50 sq ft cartridge at 7" outer diameter and 10.75" long. Buy whichever is cheapest at the time with solid recent reviews.
Is the Caldera 33016 the same as the PCD50?
Yes, physically the same filter. Caldera 33016 is an OEM number, meaning it is the code Caldera put on the cartridge that shipped with the equipment. Caldera does not manufacture cartridges. Pleatco, Unicel, and Filbur do, and they sell the identical part under their own numbers at a lower price. Match the dimensions against your old cartridge before ordering and you are covered.
Do I have to buy the Caldera version?
No. Nothing about the housing requires an OEM-branded cartridge, and the warranty on your equipment is not voided by using an aftermarket filter that meets the same spec. The reason to buy OEM is convenience, not performance. The reason not to is price, which is often a meaningful gap for an identical part. What matters is that outer diameter, length, and end-cap style all match.
What size is the Caldera 33016?
7 inches in outer diameter, 10.75 inches long, with 50 square feet of filter media. Both measurements need to land within about an eighth of an inch, and the end caps have to match so the cartridge seats correctly when you close the lid. Measure your old one rather than trusting a number that has worn off the label.
Last verified August 2026