Review on GOLDEAL Bio Balls Ceramic Rings Set: The Ultimate Aquarium Biological Filter Media with Mesh Bag for Fish Tank and Pond - Premium Fish Tank Filter, Decorations & Accessories You Need! by Ashley Cook

Wide range of filter media. The best choice when you are not sure which type to choose. Includes a mesh pouch for easy removal for cleaning etc. Also includes activated charcoal in a separate pouch - glad it's separate from the rest of the media because we like to use it with one tank and not the other tank. I'm glad we don't have to pick them from a list if we don't need them. Been using them in a DIY canister filter for about a month now and we have a perfect growth of beneficial bacteria. Keep the aquarium in good condition without problems with NO2 or ammonia. I've just started using a different batch in the drip filter and we're expecting the same good results. Note: Before installing the filter, the filler must be flushed. The new one has a lot of dust.