@richard/kirbykid63: Well, I am glad to hear my advice was of some help to you. As far as generic Miracle Mate bags, I know I have seen generic ones being sold on Ebay a while ago....so just keep your eyes peeled. Or, ask your local vac dealer to enquire about them with his local parts distributor. I am sure he would appreciate it, actually, if he could get generics to sell at a lower cost to his customers.
However, if you are picking up fine dirt, I would just stick to using Tri-Star bags with a Miracle Mate bag top, as I suggested. In my area, I find I pick up lots of sand & fine grit, & it clogs easily, so it's really easy to just take the bag outside & dump the contents outside & reuse the bag a couple of times. Thats why I started using Tri-Star bags....I found the Miracle Mate bags had too much filtration, & of course got frustrated with having to throw out expensive bags with hardly any dirt in them. I imagine you would also have this problem if you used the micro-lined Tri-Star bags, as the micro-liner would just cling onto the fine dust.
@david/twocvbloke: Yes, you could get the HEPA filter dome for your Tri-Star, but I would just buy the Patriot's Medik-Aire HEPA filter from them & stick it on your Tri-Star. I presently use the HEPA filter dome on my Miracle Mate, as there is no other way to do it, & that's the ONLY reason I use them. On my Miracle Mate (which is an earlier model, before they put the bag on an angle), the Patriot's HEPA filter simply won't fit into the exhaust port- the slot on the filter's pipe won't work with the pin on the Miracle Mate's exhaust port & it won't stay in place when the vacuum is turned on.
You really don't get much HEPA filter paper in the filter itself, & the filters cost anywhere from $15-$20 CDN, depending on which shop you go to, & the manufacturer suggests replacing every 6 months. The Patriot's HEPA filter, when bought direct from Schoettler Research & Engineering, is $200 US dollars. However, the manufacturer suggests changing once every 3 years, so that breaks down to $66.66 per year, compared to $40 per year changing the HEPA filter domes. Think of it this way....you are paying about the same cost per year if you owned a Miele & were changing the HEPA filter once a year, if you use the Patriot's filter.
The other thing to consider, is that the Patriot's HEPA filter is MASSIVE- my Tri-Star looks like it has a balloon stuck onto it! There's NO WAY the HEPA filter domes would outfilter the Patriot's HEPA filter, even if they were changed more frequently, due to the amount of filtering media the Patriot's filter has. As a matter of fact, the filter is so big, I would be willing to bet if one made sure the bags were changed when necessary & kept the foam filter dome clean, that most households could actually get 5 years out of each filter. Also, the Patriot's HEPA filter is a Certified HEPA, something the HEPA filter domes can't claim....
You are wise not to use the Filter Fresh filtration system Tri-Star makes for them, though, as they clog rather quickly & makes the vacuum lose a lot of it's power. I know you don't like the idea of using a clunky filter on the exhaust, but I would give it a bit of thought.
Rob
BTW- As I was finishing this post, I figured out that if you use the Patriot's HEPA filter for 5 years, it works out to $40 per year, so it would break even with the yearly cost of the HEPA filter domes.