how to flush nute burn in hydro

need an explanation on how to flush after I nute burned my plants in hydro. I am a beginner, only experience, grew 2x 1-2ft tall plants in soil as experiments in past before I threw them out.

I have been flushing with RO water for about a week+ after burning both plants in waterfarms. In the first few days I would empty bucket, wipe residue off sides of bucket and rinse. Fill with ONLY RO water. After maybe 12 hours the ppm would rise 50 points. I would let it rise to around 100ppm. And repeat the process of flushing again. Now its been about 10 days. Now when I refill with RO the parts per million only raise maybe 10 points every 12 hours. Based on what the trend has been I expect to see 0ppm - 10ppm rise when I check it at midnight tonight.

How do I know when its time to start trying nutes again? should I wait for no ppm rise for couple days? week?
they are only 4" tall and I nuked them so bad I am thinking of naming my 2 waterfarms. Fatman and Littleboy.
I fear they cannot take another shock again.

Well starving them for 10 days is not the best thing to do at all. A simple 24hr flush is fine but remember that the leafs that are affected will never recover or change back to normal. Start with 1\4 nutes and work from there.

thanks for replying.

I upped the nutes to 130ppm using lucas. they are 4" but really burnt. not sure if this is to much or too little.

I never start below 250-300 but that's fine, work from there.

started 4 diff strains direct from clone (2 weeks in kloner) on ebb flow 2 weeks ago w/RO water @1.7EC under 1K and now 2 weeks later they have 0 nute burn, 0 deficiency.

1.2 ec canna aqua lucas formula

You don't need to flush in hydro. Just correct the mistake and lower the concentration (if you really had nute burn)

You dont really flush. Just empty your res and mix a new batch with 1/2 strength max.