I had called Calavan's regarding a problem with the pool Vacuum...it was not drawing as strong as I thought it should. I had used Calavan's before & they had sent out Joe Bown who replaced the pool motor & explained how it functioned & how to adjust the levers for a variety of functions. I had called them a 2nd time, regarding a different issue...the pool vacuum, as I mentioned above. Again Joe came out & after I explained the problem, he asked me a few questions & then we went over to the pump area & he showed me the valve that adjusts the vacuum draw. Joe explained to me which way to adjust the valve, at what level he would recommend me leaving it at & how to adjust it higher or lower. He even marked the valve with a marker so I would know exactly in which direction to turn it, when I wanted to change the draw.Joe is extremely knowledgeable about his job & is very personable to speak with. I wish all service people were as "customer service" oriented as he is. I will use Calavan's again, if & when the need arises & I will definitely ask for Joe again. Since they get busy, give yourself a few days leeway so they can set up an appointment at your convenience. This is an A+++ company.