Sundance® Spas 6540-502S Spun Bound Filter Type_Front not instead of it —

not instead of it — you still keep chlorine or bromine in the water

A truly clean hot tub takes two things most owners never do together: purging the hidden biofilm out of the plumbing

Low pH does real damage

taking the place of OEM part PVT 50WH

The original (smaller) Flippin' Frog cartridge is sized for pools 2

Sundance® Spas 6540-502S Spun Bound Filter Type_Front not instead of it —Sundance Spas 6540 502S Spun Bound Filter Overview Replacement filter for your Sundance Spa. This filter is designed to be used in conjunction with filter 6540 501S for a deeper filtration process. This filter is open on both ends. This filter is a disposable filter. What's in the Box 1 x Sundance Spas 6540 502S Spun Bound Filter Compatibility 780 Series: 2007 2025 Select Series Constance 2011 2018 Victoria 2011 2018 780 Series Bahia 2006 Cayman 2006