POOLPURE Replacement Spa Filter for PPM35SC-F2M, Unicel 5CH-

The Verdict

If your spa water has that faint musty smell or your jets feel weak, the culprit is almost always a clogged filter. Replacing it is one of the cheapest fixes in hot tub ownership — provided you buy the right cartridge. The POOLPURE replacement for the PPM35SC-F2M (cross-referenced as Unicel 5CH-352) is one of the most popular aftermarket options on Amazon, holding a 4.7-star rating across 235 reviews. Here’s what you need to know before you add it to your cart.

What You Actually Get

The package contains a single filter cartridge. That’s it — no gaskets, no O-rings, no cleaning spray. The filter itself measures roughly 8 inches in diameter and 7 inches in height with a 2-inch opening, matching the OEM specs for the PPM35SC-F2M. You’re getting 50 square feet of filtration surface area, which is standard for this size class. The pleated polyester media is the same material type used by OEM manufacturers, though POOLPURE uses their own pleating density.

As shown in the product image, the cartridge features a reinforced center core and rigid end caps. That’s the first thing I look for in an aftermarket filter — flimsy end caps are the #1 cause of premature failure because they crack and let unfiltered water bypass the media.

Fit and Performance

The most common fear with aftermarket filters is fitment issues. Based on buyer feedback, this POOLPURE filter is a true drop-in replacement for the PPM35SC-F2M. One reviewer noted, “Fit perfectly in my Hot Springs spa — dimensions were identical to the OEM filter I replaced.” Another confirmed, “Worked on my Caldera spa without any modification.” That’s the reassurance you need when buying a replacement sight-unseen.

The dual-layer media handles the typical spa debris — hair, skin cells, oils, tiny leaves — down to about 10 microns. Several reviewers mentioned noticeably clearer water within a day or two. One long-term owner said, “I’m on month 14 with this filter, and it’s still holding up. Clean it every 3-4 weeks with a hose sprayer and it keeps performing.” That’s a solid lifespan for a filter in this price range.

What Buyers Consistently Praise

Looking through the review patterns, three things stand out:

• Fit accuracy — Multiple owners of Hot Springs, Caldera, and Tiger River spas confirmed it matches OEM dimensions exactly.
• Water clarity — Reviewers repeatedly mention clearer, cleaner-feeling water after installation.
• Value for money — At a significant discount to OEM cartridges, buyers feel they’re getting OEM-level performance for less.

Where It Falls Short

Let’s be direct about the tradeoffs. First, there’s no gasket included. If your old filter’s O-ring is worn, cracked, or missing, you’ll need to buy one separately. That’s a minor annoyance, but it’s worth knowing before you plan a filter swap.

Second, the pleats are slightly stiffer than the OEM filter out of the box. This means water flow through the filter is marginally reduced for the first few days until the media softens. It’s not noticeable in most spas, but if you already have a weak pump, you might feel a subtle difference initially.

Third, the filter’s lifespan claims are aggressive. POOLPURE suggests replacing every 12 months, but that depends heavily on how often you use the spa and how well you maintain water chemistry. Heavy users with hard water will likely need to replace closer to 9 months.

Who Should Buy This

This filter is ideal for:

• DIY spa owners who want OEM-level performance without paying dealer markup
• Hot Springs or Caldera owners with PPM35SC-F2M filter part numbers
• Someone looking for a multi-pack option — many buyers order two at a time to keep a spare on the shelf

Skip it if you need a gasket included, or if you have a spa that requires a non-standard filter configuration.

FAQ

Will this fit my Hot Springs spa? If your current filter is a PPM35SC-F2M or cross-references to Unicel 5CH-352, yes. This is the same physical dimensions — 8" diameter, 7" height, 2" opening. Check your owner’s manual for the part number before ordering.

How often should I clean this filter? Every 2-4 weeks depending on usage. Rinse with a garden hose, soak in a filter cleaner monthly, and replace annually or when the pleats start collapsing.

Is this an OEM filter? No, it’s an aftermarket replacement. It’s designed to meet or exceed OEM specs, and the 4.7-star average across 235 reviews suggests it does. But if you require OEM parts for warranty purposes, this isn’t it.

The Verdict

Buy it if you want a direct replacement for your PPM35SC-F2M filter at a reasonable price, and you don’t mind reusing your old gasket.

Skip it if you need a gasket included in the box, or you’re under warranty and require OEM parts.

Rating: 4.6/5 — A well-made aftermarket filter that matches OEM dimensions precisely and performs comparably. The missing gasket and slightly stiff initial pleats are minor deductions from an otherwise solid product. For the price difference versus OEM, most spa owners will be satisfied with this choice.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.