What is the cost of general maintenance on an underground pool?

It is large enough for a backyard pool. 9 ft. deep in it deepest. Salt water. Not heated. I want to know how many weeks to be the general maintenance of weeks is necessary for this pool. ? Electricity for the pump? Chemistry? etc. What should I expect?

I own a company in the pool and the pool, most companies charge anywhere from 150.00 to 250.00 per month to the normal flow of Maintain 50.00 75.00 giving a total from 200.00 to 325.00 a month.depending on your electric provider

Burke Pool Service, Inc Tampa, FL