Talking about plumbing issue, about 10 years ago, a plumber told me that he spent several hours trying to unclog the plumbing of an AMP because whoever worked there flushed a lot of condoms down the toilet, and they got stuck at an elbow bend some distance from the toilet. So yes, some amps do legitimately have plumbing problems. Of course, this is completely unrelated to the specific spa we are talking here.