Looking for new pump and filter.

[Gil123]

Looking to put in a new pump and filter system in my mom's pool. She has a 13,000 gal pool. That stopped priming the pump and filter is about 40 years old.
Hoping to save money by installing myself. Looking for something with low maintenance and reasonable price any help out there? I stop by 2 or for times a month to clean and put chemicals in.
Pool doesn't get much action but it does have a small water fall on one side.

Any advice on what system to buy. Thats not pricey