Shape jewelry and objects like metal wristwatches, rings, earrings, bracelets, necklaces, and hairpins should be taken off before entering the pool. These types of shape objects can puncture the PVC ring, just as small gems from jewelry may suck in the filter pump, causing further damage. Please see the cartridge cleaning instructions from the manual, if jewelry or gems stuck in the filter pump. Take the cartridge off, making sure to shake the gems out from the inlet by holding the filter pump upside down.