Leisure Time O-02 Filter Clean Cartridge Cleaner for Spas and Hot Tubs, 1-Quart, 2-Pack

Have used this one in the past and definitely recommend

We have used this product on our spa filters for years. We buy it again and again. It's pricey, but it works.

The media could not be loaded.  This filter was brownish black before. I will update it with a before picture when I clean it again. This stuff is amazing. I let this brownish black filter soak that was choked with stains, cat hair, (don’t ask ugh) and bugs for 24 hours and it works miracles. It looks brand new! Smells great and washes clean with no residue in pool. This stuff is worth taking the swim spa down for a day to do, but if you want to reduce down time, buy another set of filters and then you always have a clean set free. Thank you Leisure Time! This stuff is the best I’ve ever used.

This stuff is great. Worked well and easy to use. A little spendy though.

It's crazy what it takes out..Makes you sick when you see it. But it does clean.Just would be nice if it did both filters at once.Make sure you wash with clean water very well.....

Filter comes out clean after overnight soak. Does exactly what is advertised, cleans the filter.

After trying a couple other brands, I've come back to this LeisureTime cartridge cleaner. It works.One hint: I use a large (40 gal?) plastic trashcan and soak my cartridges in the cleaner + water solution for about 20 minutes before rinsing. I can soak all 4 cartridges at once and allows the cleaner to really work at releasing the caked-on silt/sludge that sticks to the pleats.Also, for rinsing: I found the blue and yellow "comb" style cartridge cleaners to be very poorly made. I went through two of them (both developed cracks and leaks in the MAIN BODY of the unit!) before switching to the orange and grey "jet style" cleaner. Just search for "wand cartridge cleaner" on Amazon and you'll see them for around $15.This cleaner, combined with the hose wand for rinsing, create a good solution. Just be patient to rinse out each cartridge thoroughly; spend time to clean and rinse the full length of each individual pleat. This is a MUST. If you don't thoroughly rinse the cartridges you'll have murky (soapy) pool water for days (trust me, I know). And if you don't spend the time to clean the dirt, silt and grime from each individual pleat then you'll be doing this again in a few months (again, I know).

Really great product. 1st usage: I Mixed up a 5 gallon bucket, cleaned 6 out of 8 perfectly. The last 2 were really in bad shape, and I don't think anything could get them clean, so I replaced those. Now have 8 beautifully clean filters to rotate (my tub takes 2 filters) until they get icky enough to repeat the process in the fall. Really a great product for those who have obtained multiple sets of filters over the years. 2nd usage notes: I find that 2 filters in. 5 gal bucket takes about 1/3 of this bottle. The 5 gallon bucket will soak clean all 4 PAIRS of filters my hot tub uses 2 at a time. The second time I used this, the filters are foamy, which tells me I need to use less product. I will also pre-rinse my filters again before putting them in the tub to get rid of the foaming problem. Still love this, still highly recommend!

Cleans well but too expensive in comparison to the same kind of product @ canadian tire.