Hello please can anyone help,we had a new hot tub delivered wed am and all fine set it up and was in it wed night,thru morning hubby checked ph level and showed high so he put a ph decreaser in,on the first day we added a bromine tablet in a mushroom to water.since hubby did that a brown foamy oily substance has collected all around the edges and continues to every time the jets go on.could anyone tell us what we have done wrong,we live in a hard water area.many thanks Michelle