Sundance® Spas 6540-501S MicroClean Filter Spa Parts The "2-in-1" name refers to

The "2-in-1" name refers to the two cartridges it carries — minerals on one end

084 square inches of cooking surface

Rough plaster also increases algae problems and makes cleaning more difficult

not cost-per-filter

Pro Tip: Balance alkalinity before pH — always

Sundance® Spas 6540-501S MicroClean Filter Spa Parts The "2-in-1" name refers toSundance Spas 6540 501S MicroClean Filter Overview Replacement filter for your Sundance Spa. This filter is closed on the top, while the bottom is open. This filter is to be used in conjunction with filter 6540 502S for a deeper filtration process. What's in the Box 1 x Sundance Spas 6540 501S MicroClean Filter Compatibility 780 Series: 2007 2025 Select Series Constance 2011 2018 Victoria 2011 2018 780 Series Bahia 2006 Cayman 2006 Palermo 2006 780