Hot Spring Tri-X 73178 | Ceramic Spa Filter
The Tri-X 73178 replacement filter is a factory-original ceramic cartridge filter for Hot Spring Spas, made by Watkins Mfg. Its ceramic pleats are engineered to filter twice the water per minute of a standard paper filter — delivering noticeably clearer water, less frequent cleaning, and an estimated five-year lifespan.
Your filter is the hardest-working component in your spa. It's what pulls body oils, lotions, hair, and fine debris out of the water before they cloud it, feed bacteria, or coat your plumbing. A tired or undersized filter forces everything else to compensate: the water goes dull, you burn through more chemicals, and your pump and heater work harder against restricted flow. Getting the filter right is one of the highest-leverage things a spa owner can do.
That's where the Tri-X design stands apart from the common polyester "paper" filter. Its rigid ceramic media captures twice as much from the water while allowing higher flow to the jet pumps, and it's durable enough to be cleaned with high-pressure water — or simply run through your dishwasher. Better clarity, less maintenance, and years of service from a single cartridge.
Hot Spring®
Hot Spring® Brand FAQs
Who makes Hot Spring spas?
Hot Spring spas are made by Watkins Wellness, a company with more than45 years of hydrotherapy expertise and part of the Masco family of brands. Hot Spring is one of the most recognized and highest rated names in hot tubs, known for legendary massage, easy water care, and leading energy efficiency.
What are the Hot Spring spa collections?
Hot Spring offers four collections. The Highlife® Collection is the flagship line, with premium design, specialized jets, smart water care, and 100% filtration. The Limelight® Collection features advanced design with targeted jets. The Hot Spot® Collection delivers the essential Hot Spring experience with comfortable jets and a salt system. The Freeflow® Collection offers Plug-N-Play ease with gentle jets. Hot Spring also makes the Vigor™cold plunge.
Which filter does my Hot Spring spa use?
It depends on your model and year. Many Hot Spring spas use the Tri-X ceramic cartridge filter, marked P/N 0969601 on the top, while others use polyester (paper) cartridges or the larger filters found in Limelight models. The most reliable way to confirm is to check your owner's manual, or pull your current filter and read the part number printed on it. Also check how many filters your spa takes, since some models use more than one.
How often should I clean and replace my spa filter?
As a general rule, rinse every two weeks and deep clean periodically with a dedicated filter cleaner to dissolve the oils a rinse can't remove. Replacement intervals depend on the type: polyester cartridges are typically replaced aboutonce a year, while a Tri-X ceramic filter can last up to five years with proper maintenance. Replace any filter sooner if the pleats are torn, flattened, or permanently discolored.
Are genuine Hot Spring filters worth it compared to aftermarket?
Factory-original filters are built to the exact dimensions and flow characteristics your spa's filtration and jet pump systems were engineered around. An aftermarket filter that fits the opening may still restrict flow or filter less effectively, which can make your pump work harder and leave your water less clear. Genuine filters are the safest choice for protecting both water quality and equipment.
What makes water care easier on a Hot Spring spa?
Hot Spring builds water care into the spa itself. Many models use the FreshWater® IQ salt water system, which monitors water hourly and provides clear instructions with Precision Dosing to help keep water balanced with less effort. Combined with effective filtration and a regular cleaning routine, that's what keeps Hot Spring water clear and comfortable with minimal hands-on maintenance.
About Hot Spring®
For more than 45 years, Hot Spring has been one of the most trusted names in hot tubs. Built by Watkins Wellness — part of the Masco family of brands — Hot Spring spas are engineered around a simple promise: heat that soothes, crystal clear water that invites, and innovation you can actually feel. It's a wellness experience designed to help you unleash your best self.
That promise comes down to three advantages owners notice every day. Better massage, from decades of hydrotherapy expertise and specialized jet systems that deliver a personalized soak. Better water, through exclusive technologies like the FreshWater® IQ salt water system that helps keep water balanced with far less effort. And better energy, with the Energy Smart® System that keeps water hot and ready while holding operating costs down.
The lineup spans four collections — the flagship Highlife®, the design-forward Limelight®, the essential Hot Spot®, and the Plug-N-Play Freeflow® — along with the Vigor™ cold plunge. Genuine Hot Spring parts and filters are built to the same standard as the spas themselves, so your equipment keeps performing exactly as it was engineered to.
