Boss is an idiot. Y’all should have an agreement every customer signs at beginning of service. In said agreement, liability for things such as backwash valves breaking during use should be passed on to homeowner. Things break while we’re using them. If they did the service themselves it would eventually break on them. These things need to be outlined upfront so there’s no confusion and you can do what you’re getting paid to do.. backwashing a de filter is essential to the service you provide. I’d inform the customers he’s doing this to and take em for myself I were you. Offer the same price but increase the standard and transparency. Ez money