dwc flushing help

as above this is my 1st grow using a dwc im using the whole canna aqua range im using 50/50 ro tap water im 7 weeks in flower and im getting a cal/mag defiency ive not flushed at all during the whole veg/flower cycle so i think i have nute lockout so how do i flush do i just use plain ro water for 24 hours then go back onto nutes any info greatly appreciated

to flush you would just drain all your nutes/water now, then refill with only RO water

Ya I would just fill the buckets with some clean RO'd water, unless you tap water is fine. Run them for 24hrs with clean water and it should be good.

Your plant should show a slight deff late in flower. If it is still growing fine just let it flush out. I like to start my flush in dwc when i start to see amber trichs. Alot of times my older leaves will yellow and fall off late in flower. The hardest part with flushing is timming it right.

^^ thats true. growing the same strain twice and over again helps you pin point the timing