Is the delta (Δ) P gauge on a clay treater actually telling you anything?
Not really, this is a common misconception. The only true way of testing if the clay is working is evaluation with the MSEP test. This test compares the product at the inlet and outlet of the clay treater. The outlet reading should be higher than the inlet value. Good quality fuel has a reading of 90 or higher, with 100 being the best quality fuel. If the inlet fuel and outlet fuel both have a reading of 80, the clay needs to be changed.
