Uses up to 50% less water. Anti-Microbial helps protect filter from the growth and Migration of Mold， Fungus， Algae & Bacteria. For Best Performance， change at least twice per heating season， maybe more depending on water conditions & frequency of use. Waterpad that fits: Aprilaire 110， 220， 550， 550A， 558 (10); Bryant HUMBBSBP 2212， 2312， 2412， HUMBASBP 2312， 2412; Carrier HUMCCSBP 2212， 2312， 2412， HUMBASBP 2312， 2412; Chippewa 220; Hamilton 12HF (EP037); Honeywell HE220A/B， HE225A/B; Lasko 5000L， 5000EC， 6000; Lennox WB2-12， WB2-12A; Totaline P110 SBP 2212， 2312， 2412.

Uses up to 50% less water than a standard metal pad

Surface treated with MicroFree anti-microbial coating to protect against contaminants and bacteria

Fits models: Aprilaire 110， 220， 550， 550A， 558; Honeywell HE220A/B， HE225A/B; Lasko 5000L， 5000EC， 6000; including select Bryant， Carrier， Chippewa， Hamilton， Lennox， and Totaling models

Water pads are crafted to generate higher output and stronger absorption

Paper design with metal support; replace at least twice per season