Silver Sentinel Disposable (Thread-In) | Small

The Silver Sentinel Disposable Filter (Thread-In, Small) is the compact-format version of our standard Silver Sentinel Thread-In. It threads into the smaller-footprint ArcticSpas-logo filter intake found on smaller Arctic Spa models built in 2011 or later.

How a disposable filter works: Silver Sentinel filters are made from hundreds of microscopic layers of porous polypropylene (the same material as plastic drink bottles). Each pass of water through the layers catches progressively smaller particles, so you filter out far more debris in less time than a pleated cartridge can. When the filter is full — typically after about three months of normal use — you toss it in the recycling bin and thread in a new one. No cleaning, no soaking, no buying filter cleaner.

Will this fit my spa? Yes, if your Arctic Spa is a 2011+ model with the smaller threaded ArcticSpas-logo filter intake (typical of the more compact spa footprints in the lineup). If your spa has the standard-size threaded intake, you need the regular Silver Sentinel Thread-In instead. If you have a pre-2009 spa with a drop-in filter (no logo on top), you need a Silver Sentinel Drop-In. Not sure which fits? Bring your old filter to any of our three Ontario showrooms.

How long it lasts: Most spa owners get about three months out of a Silver Sentinel before water flow starts to drop and it's time for a fresh one. If you have heavy use (daily soaks, multiple bathers), expect a slightly shorter run — maybe 8-10 weeks. Either way, the math usually works out cheaper than a pleated cartridge plus quarterly soaks in filter cleaner.

Quick tips:

• Want a reusable option? The Pleated Small Thread-In is the cleanable equivalent — same fit, lasts longer, more upfront effort
• If your spa has been losing water flow over the past few weeks, the filter is the first thing to check before calling for service
• Silver Sentinel is recyclable in most municipal blue-bin programs — check your local guidelines