using canna flush???

Hello im planning to flush my over fert plants today .
Im cleaning my 8 pot willma drippfeeder with oxyplus then i plan to and the canna
flush to fresh water.
my question is ,
how long do i need to run my pumps, do i water as normal or leave them on for a certain amount of cycles.
ie i have a 70 ltr tank ,do i pump 70 ltrs or 140 ect until i change the flush mix back to nute solution ???
Thanks Terrorfish
 
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