Guardian Technologies GGHS15 Aquastick Antimicrobial Humidifier Treatment, 2-Pack, Pure Guardian Humidifiers, Evaporative Humidifier Water Tanks

We are in Michigan, which has a whirlwind of humidity fun throughout the winter months. Depending on the year, we have a VERY dry house the entire season but other years, there's an ebb and flow with warmer than normal temps. This has made it challenging for us to maintain the four humidifiers that we typically bring out 3-4 months per year. If they are running nonstop, I've learned that the filters last longer but when humidity ebbs and flows, we get a faster accumulation of buildup and need to replace filters frequently. I've tried chemical additives, vinegar, and rinsing filters off to maximize life. It's super annoying and time-consuming and has been minimally effective.Last year I tried these on a whim and was delighted at how well they work. We had a mild winter that didn't require humidifiers to be constantly running and ALL of our filters remained clean for over a month. The typical pink/black/brown slimy and odorous filters that needed to be changed sometimes biweekly, we had a collection of slightly colored filters. This came at the end of our winter, so I pitched the filters but have high hopes for a much smoother experience going into another Michigan winter.I wish I had given these a chance before. I was a skeptic but no more as these have earned a coveted space in our Subscribe and Save lineup for annual home maintenance items.

I've been using these for years now. 2 in each of my 2-gallon tanks and they seem to work great. However, I am venturing out to try some cheaper versions because I just can't afford these easily. My city water is quite bad and I replace every 30-days. I might very well come back because these DO work amazingly well.

These keep the filter and scale build up down which saves on expensive filters and my time scrubbing. Just drop in the water tank and it last longer for me as I use Reverse osmosis water in my humidifier.

I use these often since I always have a humidifier running in the winter. They're easy to use and should fit in most humidifiers.

I have large humidifier in my apartment and use it all winter. Black, sticky mildew built up inside the humidifier. I had to clean it often. I checked with the manufacturer about using a mildew preventer, and they discouraged using this product. The humidifier is so hard to clean that I rejected their advice and used it anyway. It prevented the build-up. I've used it for three years with no harm to the humidifier.