This side conversation has been split off of this topic. JasonLion
I have an Intellichlor, DE filter and heater (all Pentair). All the water flow goes through my IntelliCHlor, No Tee!
What was there PRIOR to the IntelliChlor? Perhaps the previous chlorinator required a Tee...I think you're right though, whoever did the installation did not do something right. All the pool water from the filter should flow through the IntelliChlor, there should be nothing bypassing the inlet.