Beachcomber’s 35 square foot microfilter-2 pieces provides replacement for older Beachcomber hot tubs as well as some other older off-brand spas. These are generally pre-1995 models that would require this older style, two piece microfilter for the ‘upfront’ style of weir. This style has the blue stem on one partially glued in place for easy retrieval; this piece is to be placed in first, then the second piece without the stem, on top.