Re: sweetwater stones
The pic with the rulers is a pic I took of mine when they came in. Still haven't run them.
I just took these pictures of me blowing air through one of them with my weak lungs.
Blowing a little and then a lot.
Is this a fine mist? I suppose it might depend on the pressure you are running. It is finer with less pressure but when you blow through it you can get the bubbles just as big as any airstone. In order to get the small bubbles I had to blow just enough to leak some bubbles out, one or two tiny streamers. Any more pressure than that and it's normal bubbles.
It looks like a normal airstone to me.
Insanity - Doing [or asking] the same thing over and over again and expecting different results. -Einstein