Polaris - Black Sand & Silt Ultra-Fine Debris Bag for 3900 Sport - W7230109

Polaris – Black Sand & Silt Ultra-Fine Debris Bag for 3900 Sport

This is the genuine Polaris replacement ultra-fine debris bag (W7230109) for the Polaris 3900 Sport automatic pool cleaner. Constructed from a finer mesh than the standard all-purpose bag, it captures very fine particles — including sand, silt, mud, and dust — that the standard bag simply cannot retain. It ships as original equipment on the 3900 Sport alongside the standard bag, making it an exact like-for-like replacement.

Compatibility

This bag is designed specifically for the Polaris 3900 Sport pool cleaner (W7620000) and corresponds to position 47 in the official Fluidra exploded-view diagram. It is not a universal bag — always verify your cleaner model before ordering to ensure a correct fit.

Why Genuine Matters

As an original Polaris part, this bag is manufactured to the precise mesh density and attachment tolerances required by the 3900 Sport. Aftermarket alternatives may use coarser mesh or imprecise closures, reducing filtration efficiency and risking poor fit. A genuine bag maintains proper suction balance and ensures the cleaner continues to move and collect debris as intended.

Installation

The bag attaches directly to the 3900 Sport’s debris canister and is designed for quick, tool-free swapping. Simply remove the old bag, attach the ultra-fine bag securely, and return the cleaner to the pool. Empty and rinse the bag regularly — especially when used in pools with heavy sand or silt load — to maintain suction performance.