black diamond stoneworks ultimate spa filter cleaner fast-acting spray for hot tub, jacuzzi & pool filters. black diamond stoneworks 💎 cleaning your spa or pool filter has never been easier or faster! the name says it all, ultimate spa filter cleaner! forget soaking your filter overnight.no more waiting hours or even overnight to get the filter clean. you want to spend your time in the spa or hot tub, not waiting for the filter to be clean. it will improve the efficiency and the and life of the filter as well as keeping the water crystal clear. compatible with all sanitizers. easy to rinse and leaves no slimy residue that can cause foam. safely cleans all types of pleated spa/pool filter cartridges. will remove body oils, suntan lotion, grease, and other organic material fast and completely. to use: spray the filter with the ultimate spa filter cleaner making sure to saturate all filter surfaces where possible. wait 5 minutes and then rinse with a hard stream of water. that is all you need to do! re-install the filter and enjoy the relaxing jets as they caress the stress of life away. we recommend cleaning your filters every week to keep them working efficiently to clean the water.