What is this an advertisement? lol.
you water the same way you always do - after an appropriate dryback. If you want to something advanced like multiple fertigations per day, you need a properly sized pot and plant to warrant it and avoid the risks of an overly wet/all the time root zone. The plant should probably drink at least 33% of the water weight. I'd also make sure to get at least 10% runoff on the last fertigation of the day -- this is assuming soilless substrate for such a thing. Looks like you got some pre-charge of nutes? so realtive to that. don't try to mix methods.. shit or get off the pot is better.
strongly suggest you use different emitters. Those adjustable things suck. I made that mistake, too. If you adjust one, you have to adjust them all as athe pressure changes. A little gunk building up? gotta adjust them all again, lol, and no gaurantee what you do the first time around fixes it, likely adjusting a few more to get the pressure evened out. It's a fucking nightmare and high maintenance. Get the 1-2 gph pressure compensating emitters and save a huge headache. Put a shut-off valvue going to each pot for convenience. Plus, you can avoid the headach of 1/4" spaghetti line nonsense.
Should diy irriation. It'll be better than any kit. Get one of thos 3gpm / 45 psi pumps, an in-line pressure regulator and you are golden. I make sure my 1/2" line has a ceiling of 20psi so nothing gets blown out.
And, holy shit 40L pots? Are these growing outside? you can definitely downsize on those pots. You'd have to have a pretty large plant to warrant so much substrate. it'd stay saturated so long the water would stagnate in the substrate.