EcoPlus Medium Round Air Stone for Aquariums, Hydroponics & Fish Tanks - 48 Pack - High Oxygen Output Aeration Disc for Water Circulation and Healthy Fish

The stone works good. The only reason I gave 4 stars is because when it was shipped to me, both stones I bought were out of the original package and rolling inside the boxes they were shipped in. They weren't damaged because of the packing material but it was like the put the stones in the shipping box then added the package the stones were in after. But other then that no complaints.As I write this review on a product I received 3 days ago and again today (purchased a 2nd one), I see that it suddenly went up in price by about 30%. I don't approve, so I subtracted a star. It's a great product at a decent price. With respect to some reviewers having a fit because they think it leaks around the top, um, no... it doesn't. Two things. First is the ol' path of least resistance deal, which is where the airline enters, so if you have an underpowered pump, it's going to just trickle out there. From playing with this product and various pumps, I'd recommend at least a 2W pump to drive it properly (I mean, really, it's the size of a V8 can-- give it some love). Secondly, the flow of bubbles becomes more uniform as the stone sits and saturates with water. After about half an hour the bubbles were distributing nicely. So, this guy sounds like he likes this product, so why the 3 stars? I think people overrate or underrate products on Amazon (and movie review sites for that matter). They tend to treat a five point scale like a 2 point scale. Either they're pissed and give it a 1 (with "OMG, why oh why can't I give it a zero?!") or they're satisfied and it's a 5. One star subtracted for the fact that it can be had for cheaper (but Prime free shipping largely offsets that for me) and one star subtracted for their sudden jump in price (just rude). Okay, I would give it 3.5 stars, which would be a 7 out of 10, but it's not a 10 point scale now is it? One final note. It's big! I mean, people should be comfortable with the size of their airstone, and they say that it's not the size of your airstone but how you use it. I think most of us realize that this is a rumor perpetuated by guys with small airstones though.Good job for the price.Edit: It's been a year and it still puts out the same enormous amount of bubbles. Very Highly Recommended.Original Review: My favorite bubble stone so far. It puts out a huge amount of bubbles and my Oscars love swimming through the bubble stream. It must feel good. It's been bubbling steadily for a couple of months now and I haven't noticed a decrease in the amount of bubbles like I did with my previous stones and wands, so I'm pretty pleased. It's kind of hard to hide in the tank since it is so large (about the diameter of a RedBull can), but that's about the only downside. It doesn't float, and it's heavy enough that my Oscars haven't been able to moved it around like smaller stones. I'll buy another one if this one ever quits on me. Highly recommended.I thought it was a good air stone at first but didn’t work long in hydroponics maybe they were made for an aquarium.. to pricey for the time it worked….I have purchased four of these (large version)air stones and they are good stones. They throw plenty of air but in more, smaller bubbles than the last two stones I owned. This finer dispersion is surely a good thing for oxygenating roots. I have three hooked up to an Ecoplus commercial air one 18 watt pump that throws 38 LPM period. No volume control. I replaced cheaper, smaller stones with these and any trace of slime or rot in my DWC is gone. I have not seen a speck of root rot or slime or whatever it was since I switched to decent equipment. Air stones seem difficult don't they?Bubbles ... bubbles ... and more bubbles popping the surface of my water. Made me feel like singing the old tune, "Tiny Bubbles" out loud and with gusto. Granted, you have to have the right capacity air pump for air stones to work right (I use a 16.5L/min pump), but with that a given, this product ROCKS (no pun intended)!!! I've had other manufacturers' air stones and never found one nearly as good as this bad boy is ... glad I ordered 3 of them. When I need replacements, I know what I'm going to order.Perfect. Over the course of one growing season no part of it clogged. It does its job nicely. Great value for the money. Thick enough to make good sized bubbles spread out.