In the beginning, the sandbox dedicated to eliminating the need for cats must be moved to the bathroom, so that the cats get used to entering the bathroom when feeling the desire to eliminate the need, and every day we bring the sandbox closer to the toilet and reduce the amount of sand in the box, and we continue this matter until the cat gets used to To eliminate his need in a box without sand completely, and here he prefers to replace the box with a small circular plate, and put it next to the drain on the bathroom floor.