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 350， 360， 560/A， 568， 600， 700， 760/A， 768 (35); American Standard 300A (BAYPAD02A1310A); Bryant HUMBBSBP 2217， 2317， 2417， HUMBALBP 2317， 2417; HUMBBLFP 1218， 1318， HUMBALFP 1318; Carrier HUMCCLBP 2217， 2317， 2417， HUMCALBP 2317， 2417， HUMCCLFP 1218， 1318; HUMCALFP 1318; Honeywell HE260A/B， HE265A/B， ME360， HE360A/B， HE365A/B， HC26E1004， HC26A1008; Lennox WB2-17， WB217， WP2-18， WP218; Totaline P110-LBP 2217， 2317， 2417; P110-LFP 1218， 1318.

Unique clay solution allows for the best water absorption and humidity output in the industry

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

Water pads are crafted to generate higher output and stronger absorption

For best results change once per season

Filter fits Lennox WB2-17， WB2-17A， WP2-18， WP2-18A