A Spathiphyllum, water, porous container, scissors, pebbles
Step 1: take the Spathiphyllum out of the flowerpot and carefully remove the soil.
Step 2: trim the long root system after cleaning, remove the dry leaves, and clean the root system with water after trimming.
Step 3: put the cleaned plant into a non porous container, and then fix the root system of Spathiphyllum with pebbles.
Step 4: pour water into the container. It's ok if the water doesn't pass through the root system.