samanthaiam What does their contract say they will do - every contract is different. There is a whole lot more to these systems then just checking the bleach.
Things that should get checked (this is from the states example report:
1.)Aerator - flow rate(cfm) and back pressure (psi) this requires a special gauge set. It can tell you two things whether the compressor and the air diffussers are within specification tolerances.
2.) Filter - some aerators have filters that need to be changed or cleaned.
3.)Irrigation pump - mainly a visual inspection of the sprinkler performance and checking the screen or intake of the pump for debris- clogging.
4.)Recirculation Pump - most aerobics don't have these but if they do you would check the proper drawdown (liquid level drop vs. time) and the screen or intake.
5.)Sludge Condition of the tanks or compartments (can be three to four) trash-aeration-clarifier-pump, this is checked with a clear pipe with a check valve(gives you a profile view of the clear zone and sludge.)Scum is usually checked by parting it with a shovel and measuring or guestimating. Trash tanks are typically buried but once a year is good if all the rest are being checked. Typically, if all the other tanks are being checked at every visit the trash tank pumping time can be estimated. A sharp rise in sludge levels in the aeration/clarifier compartment usually indicates the trash tank needs to be pumped.
6.)Disinfection Device- typically, a visual inspection. Some a are more complex and have routine cleaning required.
7.)Chlorine - Visual inspection for tablets or liquid (%full if liquid).
8.)Electrical circuits- check alarm,buzzers, low pressure circuits, effluent filter alarms, and etc.)
9.)Distribution system- Check the sprinklers(throw and location), drip irrigation(if not sprinklers), leaky risers, leaky pipes, and ponding or surfacing of effluent (uniform distribution).
10.)Vegetation- required to help prevent erosion and help transpiration. Must be maintained- tall grass, weeds, new trees, new bushes can block sprinklers and cause ponding.
10.) chlorine residual
11.) other maintenance or service activities required by your particular systems manufacturer.
The above is a rather long list. It can't be done in 10 minutes. It can't be done without tools. It is also supposed to be done three times a year in most cases.
