In some cases, a cracked pool filter can be sealed and repaired, depending on the severity and location of the crack. Smaller cracks may be sealable using a specific pool filter repair epoxy or sealant suitable for your filter type. However, if the crack is large or located in a high-pressure area of the filter, sealing might not be a reliable or long-term solution. In such cases, replacement of the pool filter is often the best option.