Can you explain this in detail further? You substituted a SV Microfilter bag for the Hoover Type A you say.

I use Type A on my Hoover and I do not see how I could replace it with any of those shown on their website.

It would be great to have a substitute since those Type A seem to be hard to find in the stores these days.

Here is a link that might be useful: Shop Vac Filters

dilly dally,

The substitution the OP is referring to is using type "A" Hoover bags in a Shop-Vac.

The cut type "A" bag is opened like a paper lunch bag and placed over the motor of the Shop Vac and secured by a band or clamp. This was the process of many shop vacuums in the past. Now, some models use vacuum cleaner bags with small collars like the ones on the Hoover type "A" bags.

Your Hoover type "A" bag is very common and can be found in most stores like Walmart, Target, Kmart, grocery stores, vac shops and even online.