Is this white stuff on my pots and top of coco trichoderma?

I’ve been growing in coco for almost a year now (yay!) and I always get this white fuzz on the outside of my fabric pots and on top of my 70/30 coco perlite medium. I use the Floraflex matrix pads and trays which I can’t really remove, so I usually do a 1:4 (hydrogen peroxide:water) mix and pour it on top of the coco before feeding once per week in addition to spray the same mix on the outside of the pots.

My plants are extremely healthy and don’t show any signs of distress. Temps are 70-77 degrees and RH is around 60%. There are plenty of fans inside the tent and a T6 inside and outside, pumping fresh air in and drawing air out. So I just want to make sure this white fuzzy stuff I’m seeing isn’t detrimental. I don’t use any mycorrhiza. Plants are fed (2.8 EC, 5.9 ph - Botanicare CalMag & Pure Blend Pro Bloom) 5x per day per the cocoforcannabis feeding schedule. Growth is amazing!

Any help is appreciated.

Looks like nutrient residue to me. My fabric pots get pretty nasty as well

Looks like dried salt residue to me.

i think it's all of it, hard water, depleted salts from the used up nutes, and maybe a little algae just to keep things interesting

Yeah salts... it will go a nice brown color

This happens the most with coco + multifeeds because of the constant wet/dry cycle each day, building up salts and limescale.