Of course, the larger the pool, the more time it will take to clean and service everything needed. Again, these are national average costs; your area may be cheaper or more expensive. As mentioned above, most pool cleaning services charge by the hour, unless you take advantage of a regular maintenance plan.
Small in-ground –10-12k gallons = $150-$170
Large in-ground – 13k gallons and bigger  = $175-$400
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