Happy HHTWE50F Hot Tub Filter compatible with Wellis Spas AKU0136 AKU3003 SC809

Wellis: AKU0136 and AKU3003. These filters are compatible with the following Wellis hot tubs Darlly: SC809. This has a FINE thread, not COARSE. Max-flow Core to maximise the flow through the core of the filter and improve hot tub performance.