WARNING: If you care not to read what I write, for your family and own safety please read the LAST statement.
I prefer 7" OD 25 micron socks for most systems. A good mechanical filter will force servicing often. Any mesh larger is a wasted opportunity IMO. Here is an excerpt from my "How to" flyer.
- Turn the bags inside out. Inspect for holes or tears to the filter material. Repair or discontinue use any bag that allows water bypassing of the filter material.
- Using copious amounts of freshwater under high-pressure, wash away large debris. This step allows bleach to better penetrate the bag's micron mesh and thoroughly remove the trapped organics. Plus, flushing saltwater and solid debris will save wear and tear on the machining machine.
- Run your washing machine to on a rinse cycle to rid the device of any residual soap or fabric softeners. USE GOOD JUDGEMENT! If a large amount of soap or fabric softener residue is present, DO NOT wash the bags in the device until their presence is COMPLETELY removed. Residue of cleaning products can cause protein skimmers to behave abnormally and also affect the inhabitants of the aquarium.
- Place the batch of bags in washing machine with one cup of bleach and run through a complete wash cycle.
- Run the bags through another complete wash cycle to make sure any remaining bleach is rinsed out of the bag. An aquarium safe dechlorinating agent can be added to this step but is not typically needed.
- Turn the bag right side out and let air dry.
This procedure has never failed me since I started use of 25 micron filter bags in 1998. I wash 6 to 12 bags or more every day. No casualties or protein skimmer reaction, EVER!
A couple of side notes regarding vinegar.
Although vinegar is a good household cleaner and has additional antibacterial properties, the acetic acid present is not of a strong enough concentration to be on par with the oxidation ability of bleach. Vinegar just can't remove the organics trapped within a bag like bleach. If you find that your bags aren't lasting as long between forced service intervals, ie quickly overflowing, then their pores are likely clogged and a more thorough cleaning is needed.
Lastly, DON'T mix vinegar and bleach unless you're prepared for the resulting chemical weapon. Please read the following before causing harm....
Why You Shouldn't Mix Bleach and Vinegar and Why People Do It Anyway....simple FACTUAL explanation of what is being created.