Cesspool and liner

A system for retrofitting a cesspool, the system comprising:

• an apparatus comprising:
• (a) an outer fluid retention bag having a top and a bottom, comprising an outer shell of fluid-impermeable material and having a working volume of at least 250 gallons, and wherein the apparatus is configured to be suspended in a below-ground pit such that the bottom of the outer fluid retention bag does not contact a bottom of the below-ground pit;
• (b) an inner chamber with an open bottom disposed within the outer fluid retention bag (i) defining a primary settling space between the outer fluid retention bag and the inner chamber, (ii) defining a secondary settling space within the inner chamber, and (iii) defining a fluid flow path from the primary settling space into the secondary settling space through the open bottom;
• (c) an inlet defining a flow path adapted to deliver fluid from outside of the outer fluid retention bag into the primary settling space;
• (d) an outlet defining a flow path adapted to deliver fluid from within the secondary settling space to outside of the outer fluid retention bag;
• and
• (e) one or more suspension elements attached to the top of the outer fluid retention bag and adapted to suspend the outer fluid retention bag from above, wherein the suspension elements comprise one or more of:
• a plurality of loops, a hook, one or more straps, one or more hangers, and/or a frame.