Tony Volk wrote:
Does anyone have any experience with how efficient these style
diffusers
are?


Tony, I'm running that exact same product on my 55g tank with
pressurized C02. At up to 80-100 bubbles per minute, the diffuser was
about 90% efficient with a very small amount of bubbles being able to
collect at the top only to finally escape to the surface. I was able
to obtain about 15-20ppm C02 at this rate. Since then, I've jacked up
the bubble rate to 130 bubbles per minute and calculate the C02 at
26ppm which I like better. At this rate though, more bubbles collect
at the top of the unit and escape.

Overall, my evaluation of this ladder is very positive. The bubbles
start out at the bottom at about 1/8 or 3/16 inches diameter. As they
flow up the ladder, they gradually reduce in size to about 1/32 in dia.
It reminds me of the incredible shrinking machine they used to have at
Disneyland.

steve