for the 1st 9 months we owned, we paid a pool boy $60 a month for once-a-week chemical service. (not bad, really)
I learned of TFP and took over myself in April of '16.
It runs a little more than $60 a month in the summertime($72 or so).
A LOT less the rest of the year. I now do all the maintenance on the pool myself.
Keep filter/cartridges clean, check skimmers almost daily, brush sides once a week, and test chemicals weekly.
Haven't seen Algae once since I took the controls. The leaves are a different story, but the Polaris does it's job there.
I enjoy the 'therapy....'
$350-$450 is about right for this part of Texas.