The Twilight Series Eco Pur Filter is an Original Equipment filter for
the Twilight Series by Master Spas. This filter is used in conjunction
with the Twilight Series Outer Filter
(X268512) and will work on
Twilight Series spas ONLY, dating from 2009-Current. The Twilight
Series Eco Pur Filter eliminates up to 95% of chemical use. "Pleatco
PMA-EP2 Eco Pur" embossed on filter top.