Review on 🔳 Nispira Activated Carbon Pre Filter for Holmes AER1 Air Purifier HAPF30AT HEPA Air Filter - 9.5” x 4” x 0.25” (Pack of 4 Carbon Filters) by Paul Barnes

I have an adult dog. Sometimes he writes on ceramics. I clean with vinegar. So: my apartment smells of vinegar and dog urine. I've tried air fresheners and candles. So: then it smells like vanilla. and vinegar and dog urine. I put one of these on the filter block and in less than an hour it was smelling. nothing at all. It was wonderful. I see some complaints about the dimensions; They fit on my device (Holmes Desktop HAP9243-UA) in front of the HEPA filter. There is an existing black mesh in front of the HEPA filter, but I don't think it's charcoal and left it in place. The replacement doesn't have a filter check hole, but I've never found this window to be reliable. I don't know how long the fight against the smell lasts, but so far it's been great.