There's nothing wrong with the occasional use of trichlor tablets, but you need to understand how they will effect pool chemistry. Pool Math will tell what effect an 8 oz tab ill have your pool. Trichlor tablets add CYA, FC and are acidic, which means they will also lower pH. If your chemistry allows for it, use them. If you're away from the home for a few days and can't add chlorine or muriatic acid, tablets can come in handy.