I've been using them for many years. I use reverse osmosis water in my humidifier (which prevents hard water from crusting on the filters) but I have a problem with the water/filter being pink. Somewhere I found and tried the proposed Protec cartridges. If I think about changing them every month I can usually get 2 (about 3 months) out of the filter (while still keeping the water and filter relatively clean).
Floor fan Xiaomi Mijia DC Inverter Fan 1X CN, white
33 Review
Universal Dryer Thermal Cut-Off Kit With Thermistor And Fuse Replacement - Compatible With Kenmore, Samsung, Whirlpool, KitchenAid And More
24 Review
Compact dishwasher Weissgauff TDW 4006, white
81 Review
Room temperature and humidity sensor Aqara Temperature and Humidity Sensor white CN
26 Review
Efficient BINZET DC12V LED Power Supply Transformer For Regulated Lighting
12 Review
Transform Your Refrigerator'S Drinking Water With WaterSentinel WSG-4 GE RPWF Filter Replacement
10 Review
Honeywell HEV615 & HEV620 Compatible Durabasics HFT600 Filter Replacements (4 Pack)
13 Review
ICEPURE 5 Micron Sediment Water Filter Replacement (4-Pack) For 10-Inch RO Systems Including Dupont WFPFC5002, Aqua Pure AP110, Culligan P5, GE FXUSC, Whirlpool WHKF-GD05, PP10-05 And More
11 Review