I have read several places that it needs to be 42" high for sit-down situations and 44" for stand-up only. Then the width of the counter needs to be between 16" and 18" and leave the customer 8" space for their knees underneath the counter. Hope it helps.
I am under the impression that no system is fool proof. The only positive solution is for someone to have visual contact at all times and if are too many kids then you need more adults who will dedicate themselves to this task. You need to know where the children are at all times even if you have to count them several times. You must not let your eyes wander to other things. Do not get distracted. Don't answer the phone even if it is at poolside. Another distraction. It only takes seconds for a child to drown or become trapped or entangled or bump their heads on something. A child may have medical problems or a disability. You have to have a responsible adult who will swear to dedicate themselves to the task at hand at ALL times.
Clean the leaves and rubbish from the bottom, clean the filtration system, clean out the leaf baskets, Make sure there is sufficient water in the pool to cover the static skimmer.
All pools are different after standing for a period of time so at this point I would take a
sample of pool water in a clean bottle from about an arms length down from the surface and take it to a pool shop where it can be tested and advice given depending on the results.
The cover over the spout is shaped like a whistle on the inside, except that the hole for the steam to come out of is very small. As the water starts to boil, it starts turning into steam, and steam takes up more room than water. Once it is boiling hard enough, not all of it can easily escape through the little hole, and the rest is held inside the teapot where it starts building up pressure, and as the pressure builds, the steam starts moving faster and faster through the hole.
Lawn is killed by herbacides, lack of proper watering, fungus, insect infestation, and excessive fertilizing