Before we go any further with this, please can you advise whether the issues you mention in your last email relate only to the product DIETHYLENETRIAMINE or to the product NALCO 74620 polymer, or to both products.
Please also confirm if the problem occurred when both products were cleaned at the same time, or if the issue occurred separately.
As mentioned before, we don't clean the product Nalco 74620 polymer, but have been cleaning DIETHYLENETRIAMINE on a regular basis. Has the problem always existed with DIETHYLENETRIAMINE or has it just started to occur.
Please advise.