I can see what it wants you to dose to raise your magnesium-what do you dose if your levels are where you want them-do you stop till you need to-is their a weekly dosage
First test your magnesium then leave a week without dosing any Mg source. Test again and you have your weekly consumption of Mg. After knowing that you can decide how much to dose. It is best to not raise Mg levels over 20 ppm each time you increase your levels.