I have an sd80. I just replaced the sand and put everything back together. I have it set on filter and there's water gushing out my backwash line. The toggle lever feels lose (I've been using it for 12 years, I should know). And it feels gritty switching between the different valves. When I asked my pool builder who replaced the sand and put everything back together, he said to put a winterizing plug in it. That feels unsafe and not necessary. Its 12 years old, could that toggle assembly be broken?