I have a 200 amp service and would like to add a pool filter.

2400 sq ft living space, my panel has 25 of 40 slots in use do I need additional panel, I'm trying to get a good idea of my needs prior to getting price quotes.

You will need to buy a GFI breaker made to fit your panel. Check the pump amperage requirement and go to the next size up for the breaker. Most pumps are 12-15 amps and are 110vac. What are your numbers?

If the pool is storable , probably need a 20 amp 120 volt circuit, and a permanent pool would probably need at least a 20 amp 240 volt circuit.

Do yourself a favor and use at least #10 wire for a 20 amp circuit, and #8 for a 30 amp circuit. This will help with voltage drop caused by the distance and help start the motor easier. Try to get a 240 motor , helps keep the amps low. Any pump motor will need GFI protection.

Pay special attention to grounding the pool, all metal, and the pump motor. Best to check with local codes on this.

A 20 amp 120 general purpose GFI outlet will be needed between 10 and 20 feet of the pool.

The service can handle the load easily.