Jacks 321 users question for you

[Frog]

Afternoon fellow growers .
Working on trying jacks 321 , and am wondering which part A should I use ? Growing outside using tap water that's been degassin for 2 days. Jacks has 3 part A to consider , the regular one 5-12-26 , and 15-5-20 for tap water , and 18-8-23 for outside . since I have both tap water and plants are outdoors , which one do I use.
Thanks

 

[ArtfulCodger]

Afternoon fellow growers .
Working on trying jacks 321 , and am wondering which part A should I use ? Growing outside using tap water that's been degassin for 2 days. Jacks has 3 part A to consider , the regular one 5-12-26 , and 15-5-20 for tap water , and 18-8-23 for outside . since I have both tap water and plants are outdoors , which one do I use.
Thanks

Don't forget the new 0-12-26. The no-guessing approach would be to send a sample of your water to Jack's lab for testing. They'll recommend what to use. Or just try one. I've been using the 5-12-26 with my 80 ppm tap water and it's been great.