Pros
I honestly cannot give one reason as to why a person would work at Sparkling, other than they service many pools and there may be one in a location that is convenient for you. However, you would be better served finding another company that is slightly less convenient--in the long run, you will be better served. While they might seem flexible at first, you will soon be asked to double up on shifts, drive to other zones without receiving compensation for gas, or asked to open a pool on a moment's notice.
Cons
Extremely disorganized, unfriendly staff in the office. Managers are young, inexperienced, and do not receive adequate training before going into the field--they're rarely helpful. Every manager I ever had quit after a few weeks, only to be replaced by another inexperienced, unenthusiastic employee. Guards are also paid poorly (relative to what other guards with similar experience may be paid at another company).