This is a relatively new heater tube (~2 years old) which has corroded to the point of needing replacement due to improper water care. This could have been prevented.
Hot tub water needs to be changed every 3 months. This tub wasn't heating because the filters hadn't been cleaned in ... who knows how long. Time to change the water now so I put in a spa flushing agent. It's not supposed to foam up like this. This tub water is nasty and smells.
Just one more reason why not to put a heater element into a plastic tube. Any time a manufacturer tries to re-invent the wheel it ends up costing the consumer more. Everyone else puts their heater elements into a stainless steel tube. This didn't need to happen.
