Unique Clay Solutions allows for the best water absorption and humidity output in the industry. Surface treated with Micro-Free anti-microbial coating to protect against contaminants and bacteria. Water Pad 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, 1319