OM700 Deionized filters

Yeah, those are the ones you want. They will clean to 220 Mohm-cm if you want. They work very well. Be careful of filters from other suppliers as some can’t handle the alcohol and end up cracking and then you have a real mess to clean up gallons of test solvent all over the flow. Make sure to change all eight of the filters at the same time and get the o-ring seals along with the filters as you should replace these at the same time.

Some people call them o-rings while others call them washers and they are rubber and you need one for each end of the filter. You have 8 filters, so you need 16 of the washers. I think Scientific Solutions sells the filter with or without the washers, and I can’t recall the exact part numbers, so you will want to check with them. When you remove the older filters, the washers will probably be in the fittings. So you will want to remove the old washers and replace them with the new ones. The older washers may be good, but over time they will dry out because of the alcohol – so just replace them and save yourself a potential headache by avoiding leaks.

scschris beat me to it! I just looked up the part numbers and was typing them. So I will confirm the numbers listed.

Yes, you should definitely do a chemical test after changing filters. Generally you are suppose to do a chemical test routinely to be sure the machine is working correctly. You will need some #3 Standardizing Solution and a pipette or syringe.