Placing a coffee filter in between the soil and the drainage hole allows excess water to drain from the pot while keeping the dirt firmly in place of your indoor plant.
As water passes through the filter it will retain moisture, giving you a little bit of extra time in between waterings (in case you forget).
Keep in mind, overwatering is one of the most common ways to kill a houseplant. Doing so cuts off the air supply to the roots. Additionally, it can cause root rot. Ensure your pot has adequate drainage and as a rule always check the moisture levels of the soil by sticking your finger in up to your knuckle.
How often your plants need watering will depend on the type, size of the pot and environmental factors.
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