Product review (5 stars): USE APRILAIRE
THESE PANELS DO WELL. I AM IN THE HVAC FIELD AND CAN PURCHAE THESE FOR JUST ABOUT THE SAME PRICE WITH MY CUSTOMER DISCOUNT AT THE SUPPLY CENTER BUT MUCH EASIER WITH JUST ONE CLICK AND AT YOUR DOOR. TO  THE PEOPLE STATING THEY CAN WASH THOSE OTHER #10 # 35 PADS OUT YOU SHOULD NOT .THERE IS A SPRAYED COATING ON THOSE OTHER FILTERS TO RETAIN WATER FLOW THRU THOSE BYPASS HUMIDIFIERS WHICH WILL COST MORE MONEY IN THE LONG RUN ON WATER BILLS,WASTE WATER AND NOT PREFORM AS THEY SHOULD. THESE #45 PANELS WICK THE WATER AND ARE CALLED WATER SAVER HUMIDIFERS WHICH WORK WELL BUT NOT AS WELL AS THE BYPASS HUMIDIFIERS THAT WASTE ALOT OF WATER. 45 PANELS ARE TO BE CHANGED TWO TIMES A HEATING SEASON