I do coarse then fine sponges in the bottom to catch the crud, pot scrubbies or ceramic things, floss or batting then the white micro pad. No chemical or carbon layer unless I need it. Rinse & reuse indefinately just like with Aqua clear HOBs.
Don't forget to clean the impeller
Do I need to fill the baskets? Like the bottom one is full with the sponges, then the ceramic rings fill the second basket. Then fill the top basket with floss/batting then the micros pad, as it is very thin? Sorry I am taking long to understand this, it is just very confusing so many choices and don't want to make the wrong one lol