Aqualogis Ultra+. AQUALOGIS: Harmony 2.6L, Harmony XL. Also compatible with Aqualogis Harmony, Amazon Basics AMWTFLTC15, DAFI Fduni-v3-004001, FilterLogic FL402, Unimax, Wessper WES003-MG, AQUAMAX MG+, Vyair AQK-07.
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