Here's what the cotton tails advertise:
- FILTERS TO 3 MICRONS - A tightly-woven network of interlocking, polyethylene strands filters out even the smallest particulants. Cotton Tails' filtration stands up to the best, including costly, hazardous DE systems.
- A LIGHTWEIGHT ALTERNATIVE - This 1.5-lbs. bag is equivalent to 50-lbs. of heavy, hard-to-manage sand. Stop struggling with archaic media and switch to a cleaner, simpler solution.
- LESS BACKWASHING - You'll only need to backwash when your tank's PSI reaches 25, saving you time and money.
They are still in the filter housing, I was going to run them while I sort out the water and then swap sand back in since that seems to be the general consensus of the forum. It's currently running at 20psi and the mfgr suggests backwashing at 25, so I figure once I vacuum, it will be ready for it.
There's a lot of sediment on the bottom as I've not yet vacuumed since the last fill so the bottom is pretty filthy right now.