"Under no circumstances should you keep your chlorine above 1.5 as it will ruin swimsuits and can be hazardous to your health. A chlorine level of .5 is ideal". Hummm? They obviously haven’t tested their tap water. Mine test at 3ppm....

And similar to what Michael said above and my personal favorite, “You use bleach! That will eat up all of your pool equipment and cause your PVC pipes to degrade!”