Check on Bubble Magnus to make sure it can handle the water change volume. Not used them myself. For the DOS they usually go for $300. I don't use the DOS container, I use the $3 BRS dosing jugs. Probably have a dozen of them or so and just swap one out for the other when it gets low.
I have been using the Jagers for over 25 years. I have two 300 watt ones one of my tanks which have been controlled by Apex for 10 years.
For the Gyres I don't do the maintenance nearly as often as I should. When I do I take the baskets off and soak in a vinegar solution overnight and then scrub with a brush, rinse and reinstall. Going to try citric acid next time. Read a post last week about damage vinegar can do to certain plastics with magnets in them like for the MP pumps. I have read that some folks will clean the pumps every couple of weeks to keep the flow at max. Since these are not my main flow pumps I maintain every 2-3 months. One other thing to note on these, in one tank I have some really small snails and they get into the pump and they make a horrible racket and I have to pull them apart to get the snails out.
Nice on using the old tools - a lot of times they require a lot more skill than the newer ones. I have some of my grandfathers tools that are 70+ years old and the quality is terrific.
Good point on the Bubble Magnus. I will have to look into that. The DOS is a bit over $400cdn. Gotta love that exchange rate...
I've used the Jager on smaller tanks. Never had any issues with them. Will probably go with that.
Sounds like the Gyres are a bit of a pain. Also seems like I would have to have some backup pumps for when I have to take them down to clean them. Maybe I can do one Gyre with a couple of those reef octopus pulse 4's.
haha ya those old tools can be interesting to use sometimes. His skillsaw has sparks coming out of it. Apparently it's fine though and has been doing it for years...