We are in strict lockdown due to Covid, so I’d appreciate any help as I try to navigate this on our own for the 1st time. We have had to get a new water heater every 2-3 years for the past 12 years because our TPR valve will open and completely flood our basement(never closes back off..EVER). Each plumber has always said that since the water heater is under warranty, we should just pay for the labor and get a new heater because if something made the TPR valve open, then we should play on the safe side. Anyways, it just happened again and this unit is right at 2 years old. After trying to educate myself online, I decided to have the warranty company send me out a TPR valve and to flush the unit(my thinking is that I do remember thinking that the water felt hotter than usual right before this happened and thought sediment could explain why the TPR opened in the 1st place). I will admit that I never knew that you are supposed to flush your water tank as maintenance(no one ever told me that...maybe plumbers assumed it was common sense and I should’ve known that?). So, the drain plug was clogged and then I started getting all of this bluish crap coming out(some looked like granules and other formed into slime sludge). I have city water. I plan on using a thermometer to keep checking water temp coming out of faucets when I fire it back up, but I don’t have a pressure gauge to check water pressure. I don’t want my unit to explode, so is there anything else I should be watching out for? Is this blue stuff normal? I had so much that my water hose also clogged up and I had to use containers to drain unit until the amount of sediment reduced.