Pawfly Aquarium 4 Inch Air Stone Disc Bubble Diffuser Release Tool for Air Pumps Buckets Fish Tanks Ponds DWC Reservoirs and Circulation System - 2 Pack

I bought two. One of them works great and the other one only bubbles from a little more than half the stone, which other reviewers have also said. Still plenty of bubbles. These are fairly large, which I was happy about. Suction is great. My mystery snails like to climb on them. For the price, can’t beat it honestly. If they stop working, I will update my review.

Very good bubbler! Installed 2 of them in my 200 gallon tank and my discus love it! Definitely recommend.

As the title says, these provided a significant improvement in the diffusion of air into my DWC solution. Prior to buying these stones, I used a single 2x4" cylindrical air stone per 5 gallon DWC bucket, on a total of four buckets, with all of them being supplied by a 110lpm air pump. I did not realize how underrated my old air stones were until swapping them with these, which are rated to function (4" model) optimally with a supply of 12LPM's of air per disc. I have since ordered a second set of four 4" discs with two being at the bottom of each DWC bucket, for a total of 8 discs being hooked up to the same 110lpm air pump. The difference in the amount of bubbles produced despite the same amount of air being pushed through the same amount of DWC solution has been absolutely astonishing. Out of the 8 I ordered, there are a couple that appear to not function as evenly in regards to diffusion as the others; This difference has been so minor though that I do not see it being worth returning. If you match your sized air stones with its minimum Liter per Minute of air requirement, your likelihood of receiving subpar air diffusion is quite minimal. Many people are unaware at just how much air these little guys are rated to handle, and don't understand why their 20LPM pump divided to 4 different air stones aren't evenly diffusing. Certainly not all bad reviews are a result of this, but I do think that it is often overlooked and matched with a general notion of not needing a lot of air or not understanding how much air is even optimal to begin with in DWC environments. (FYI: 1LPM of air per gallon of solution is, generally, considered to be optimal so long as water temp doesn't rise too high.)

The media could not be loaded. Here’s a comparison of pawfly air stone vs regular air stone and how much air and the distribution looks like.Air seems to circulate more and more disbursed with the pawfly than the regular air stone which shoots straight to the top.You do need a good pump though or else your pawfly won’t work properly

worked as advertised

I've wanted to buy an air disc forever and finally ended up giving this one a try. I was surprised at how big they were, which is the only positive thing I am going to say about these because I am honestly disappointed for a coupler reasons. Mainly because it only puts out the bubbles in a small portion of the disc, which is not what I was expecting. I was expecting it to look like the pics and be a full round circle of bubbles, but that is not the case. The other thing is that the suction cups it comes with are made so that the disc kind of snaps into them, but if they get bumped they easily come loos and I have crazy axolotls so it's always getting bumped and then I have to replace it... just annoying. I do not know if mine is faulty but I did try two different air pumps in case it was the strength that was the issue but both of them did not allow the bubbles to be fully around the disc and still only put out a small portion of bubbles which makes it look silly. :(

So far so good. Bad suction cup placements imo

The media could not be loaded. ordered the 2-pack and both discs are defective. when connected to the air supply air gushes out of a nearly imperceptible crack in the front edge of the housing (between the inlet barb and the blue disc material) and no bubbles come out of the disc material. however if i put a finger over the leak area and press firmly the disc works as intended and many little bubbles are generated. it seems this is probably due to a flaw in the manufacturing process. i think that when they install the inlet barb into the housing they are slightly too large for the orifice and cracked the housing causing the massive air leak. aside from this they are a very nice looking piece in every other respect. good weight, no sharp edges, the bead of black silicone on the inner rim is laid down cleanly, the suction cups work well, the barb fitting seems to be of high quality, no weird smells or residue, and the airstone component (the whole point of the item) seems to work very well (again when the leaks are covered). too bad. note: these were tested on a tetra whisper 60 (4W) and a hygger 16L/min (10W)