Got started on my triple "B" filter set, thought I'd post pics of it so far.
I have doubled the filtration capacity with this, and will be adding the third canister when I can find one. I've got an ad on the local craigslist, hoping that someone else might have one to get rid of.
According to this chart, Intex falls way short on their filter sizing.
Intex "B" carts are 15 sq ft, so by at least doubling the sq ft, I've brought the area quite a bit closer to what it should be.
What prompted my wish to do this was the amount of "blow through" I noticed with the single filter. Not wanting to go to a sand filter, mainly due to the high loss of water with the backflush/rinse cycle, I came up with this.
Note that I did leave provisions for the third canister when I find another one.
All connections between the Intex sized ports and normal 1-1/2" pipe are epoxied in with JB Weld.
As an added bonus, flow rate actually went up about 1/3 to 1/2 by guesstimate from the skimmer and return. Maybe mas985 can explain that one.