How do you guys flush during a grow in a DWC and for how long?

Hi-ya

I never flushed before 2 yrs during a grow, but I filled my res with water and had to leave town on an emergency and didn't add nutes. My plants were ok but not doing great. 4 days later I returned and thought they would be dead or SSS, but looked the same. I added the food and a few days later, BOOM! They took off, I swear they grew a foot in a week.

My grows have been about the same as soil, which was depressing, now I flush 1-2 days every 3 feeds. My grows are quite better now.

I've started adding Silica, Calmag, and seaweed to the h2o. Anybody else does this? Should I add those 3 or just straight ROH2O?

Why do you have to PH plain water? If there are no nutes why are you doing this?

Also, do you final flush, and for how long?

Uh oh. So do you drive a Ford or a Chevvy?
Flushing is one of those subjects. Do a little googling and you will find some stuff where they blind taste and chemically tested flushed and non flushed.

Maybe post a pic, what ec you use and ph levels and all that. Light also.
You ph plain water, because you don't want to change the ph of the substrate, in dwc, not sure why it matters if you aren't feeding.

Yes (Chevy). I know the ios/android talks about flushing at harvest.

I'm not asking about the point of final flush for flavor-which to me is bs, I'm talking about flushing to clear away the accumulation of nasties in the roots during the entire grow, at least last weeks of veg and beyond.

feed lighter and you won't have nute buildup.

only time i flush is if i think tip burn developed into nute lockout. the a 24hr flush with plain water and start back on lighter nutes

How do you know if you have a buildup of salts/nutes in a DWC?

I feel i'm going light as is with the jacks.

When you change the rez, you are taking care of unbalanced nutrient levels. If you could test it accurately by individual nutrient ppm and just add what it needs you wouldn't get build up or anything.
Changing out the water and fresh nutes is the solution to not knowing exactly what is needed to replenish the rez.
Makes sense to me anyway, might be wrong.

"only time i flush is if i think tip burn developed into nute lockout. the a 24hr flush with plain water and start back on lighter nutes" This is what you needed.
Tip burn=alarm. Keep the ppm below a certain threshold, it is different depending on the environment you grow in and the strain. See lots of 1.2-1.6 ec or 600-800ppm recommended, but if it eats more without burning? Feed it as much as it can take, some guys are running 2.5 ec, but it is prob a dialed room and strain.