Perfect for brewing compost tea in a 5 gallon bucket. I use it with an eco airpump to first bubble off the Chlorine for a few hours, then I add the worm compost, unsulfered molasses, unsalted alfalfa meal, fish hydrolysate (the kind is not not heat-killed),and bubble it for 24-36 hours and then strain it and use it within 4 hours as a foliar spray and soil drench. It takes care of pest control, feeding, and makes my trees and veggies huge, yummy, super healthy and abundant. Some people add extra microbes like bacilus bacteria, actinomyces and fungi (etc) in addition to the worm compost, but it's kind of redundant if you have really rich fresh vermicompost.Puts out an amazing amount of air (considering air pump quality). My only issue is it will not lay flat it floats up sideways. But all in all was a great buy.We converted our 5 gal 'Igloo' cooler into a compost tea brewer and this 4" disc is more than adequate to aerated the tea. Once I was not able to use the tea for 3 days but the batch did not spoil and still had that wonderful earthy smell. It is heavy enough to stay on the bottom without weights. It cleans easily between batches. We made about a dozen batches and the air stone disc has not clogged.The stone performs adequately...HOWEVER... I am very disappointed that it comes with a plastic hose attachment and NOT the metal one AS ADVERTISED IN THE PHOTO!!! When the product changes the description and photo should reflect that fact. Shame on this seller!The new version of this I just purchased does not look like the picture. It has a frame around it and the tubing attachment is different, It also requires a different size tubing than the earlier version so it may be incompatible with the aerator you are purchasing it for.Quality workmanship! I will continue buying this product. It can handle high air volumes, however I glued a stainless steel plate to the bottom to keep in from floating.in the picture shows three and i though i am really getting 3 not one!Lots of bubbles.Quality builtdosnt work and will not refund the order the seal ont he top always breaks i had it in water 15 days never made any bubbles false adverstiing best get a air stone at petsmart at least it will work and you dont need to buy and attachments I COULD HAVE BOUGHT ALL MY AIR STONES THAT WORK FOR THE PRICE I HAD TO PAY FOR 1 THAT DOESNT EVEN WORK