Don't forget to check that any pool cleaner is legal, insured and hopefully turns up in a van with their comonay details on
Pool cleaners typically do not check the biological make up of a pool, they just clean and check levels
A number of the people that I know on the resort use John Lester of JML, you can find him on the web or he is on site 3 days a week cleaning, white van with his name on
He isn't the cheapest but very reliable and experienced