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"Test the pH of the water from your water separator" What are you using for your water separator ?

There certainly is more than one way to process WMO. It comes down to what is practical, given market price of diesel fuel at that time. Knowing the source types of oil in WMO can help you manage your process. Same oil, similar vehicles, same change intervals = pretty stable and predictable...

"The normal pH for diesel fuel is between 5.5 and 8.0, so a reading of below 5.5 is an indicator there could be a problem". pH is a function of TBN or TAN. You can add TBN with a HOT SHOT additive.

Adding acid to clean the oil can be done. You will need to re-balance the pH pre-processing, or it will eat your centrifuge and ultimately the engine. The TBN number is already diminished in used oil. You could use calcium I suppose. Calculating the pH of oil would be a pita. You can't do it...

My long-term goal is the same. My refueling depots will be at storage units in a couple of states. Tight control over your fuel should mean better performance and less failures Hmmm no, never seen an off balanced batch... Filtermaxx have special feet. Filtermaxx sells a air powered one as...

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If you use a stand-alone centrifuge, buy a used Filtermaxx. Much more powerful and flexible than the PA biodiesel. You clock the motor up if you use a 3 phase motor and a motor controller. Steam comes out of vent. Use the sun to bring your oil up to temp before push through heater. Once you...