I use the second one in my aquaponics but can't tell you much about the first one whats the price difference?
here is one of the second one a bit smaller but it'll have much more surface area than the first one for bubbles
http://www.ebay.com.au/itm/Fish-Aquarium-Round-Sintered-Bubble-Air-Stone-Airstone-/260994396461?pt=AU_Pet_Supplies&hash=item3cc47a712d
I have been running that exact airstone for about 2 weeks now in a test setup DWC/bubbler. Working great so far (laying still on the bottom) but can't say much more than that since I've only used it for 2 weeks.I sure like this type of airstone it's just that it's so expensive here. The first one I posted is a lot cheaper so I wanted peoples opinions but maybe nobody here has tried them.
I have been running that exact airstone for about 2 weeks now in a test setup DWC/bubbler. Working great so far (laying still on the bottom) but can't say much more than that since I've only used it for 2 weeks.
I would use the 2nd. The amount of surface area on the 2nd is probably 20 times more. I personally use the big ball stones because they sink and are a lot more affordable. Plus the amount of surface area is huge.
I own several fish tanks and never have a problem with them getting dirty. After a few years in water 24/7 they connector can get brittle and disconnect, but at the price I always have several on hand as I own several large fish tanks.
im using the balls (hah!) when they clog up a quick scrub usually unclogs it and its ready to be used again.