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I follow the ACI method and let my apex control the dose according to pH overnight, it handles most of my alk/cal needs and i occasionally need to supplement alk 2-3ml depending on the consumption that day.
THIS, most car maintenance can be done yourself and everything else can be done with a trusted mechanic.
Most of my car knowledge came from being a broke high school kid who wanted to go fast lol
If possible ask around your group of friends if they recommend a mechanic that they trust. most...
i use the medium size one but i have it recirculating the air back into my skimmer which is a Aquamaxx WS-1 and it last me usually around 3 weeks or so, depending but I also use kalkwasser to drive my ph at night like ACI method.
its an older lens but still works well and you can probably find this in a good price now but i use a Tamron 90mm f/2.8 Macro for these shots and I also have a Tamron Tele-Macro 75-300mm. all budget lenses at their time and still are. I'm not professional so i never had the need for quality...
I shoot in aperture priority mode with a macro lens with a orange filter and an Avast porthole. I then use lightroom to fix the white balance. White balance correction is the biggest thing really.