I would like to thank Jason Lion for the link to this product.
I can say that it does work and I am happy with the result.
I attached this jumbo size filter bag downstream of my Pentair cartidge filter on the trolley, which is supposed to be 10 micron rating. This is my pump set on trolley, a back up of my Hayward fix unit.
I can't say for certain that the Slime Bag catch really a 1 micron particle but it does catch a lot what the 10 micron Pentair cartridge does not catch. The dirt residue when I clean this filter, it is so fine, I can't feel it with my fingers. In comparison, my other Hayward cartridge filter ( 20 micron ) dirt residue when washed, can be felt with my fingers.
I have tried this filter bag for over a week now. Wash a bit after a few days of use and push it hard. It was raining during a few days of its duty and since the rain came after a long dry weeks, the bag really catch those fine dirt which usually accumulated on my sunshade and around my building walls and roofs. I also have 8 divers for two days, this usually throw off my water clarity, but in this case it did not.
Everytime there is a big rain and after divers are out of the pool, I run this pump+bag combo at least 8 extra hours, after I switched off the main Hayward pump. Same drill everytime but this time with the bag, my water clarity has been mainained near peak with ease and faster too. So I can say that this cheap bag does work.