CTP Process - Drain Buildup

one thing, your MSDS sheets should be readily available, there is a reason for this, check with your safety officer if you have one.

I do not think at this time no one can help you until you know what chemicals one is dealing with, and this will be difficult, because its a drain, what chemical reacted with what at what time.

OK, MSDS info

Primary Chemical: P970 Test Dev NA (trade naeme) it's an offset plate developer solution. Water 80%+, disodium metasilicate 5% - 10%, and ATMP - pentasodium salt 1% - 5%

Secondary Chemical: RC510, Water 80%+, Benzenesulphonic acid (decyl, sulphonphenoxy) 1% - 5%, Poly(styrene sulphonic acid) sodium salt 1% - 5%, 1,3-Benzenedisulphonic acid sodium salt 1% - 5%

Treatment(meant to nuetralize based on recommendation of vendor AGFA):MetaAid CA50, water 50%, citric acid 50%

What they currently do is dump into a 5 gallon container and then down the drain. The treatment is meant to nuetralize and allow for safe disposal to city. Could the build up be a reaction with the PVC drain piping or possibly metal grating at drain inlet/

Oh ya, I'm the safety, environmental, maintenance manager, engineering manager, and only engineer on staff. Gotta love America and Lean manufacturing. So as a Mechanical Engineer, draw your own conclusions where my strengths are.