dwc res question pls?

i was thinking of getting a bigger res for my girls to keep everyt more stable. about how often i would change my res if it was 20/30ga?l If its every week or even every 2 weeks wuld it i be addn more neuts? i only got 5 girls is even worth going w a 20 or 30 gal res? i use 8 gal every week and add 1 or 2 in middle of week and suggestions pls will rep

if you had a bigger res you could spread your plants out more and get a bigger yield, it would create a more stable solution underneath, and you could keep your tank for longer, but you gotta clean em out regularly anyway other wise you start getting problems in the solution

so i would still add same neuts per gal of water then? if so thats fkn expensive too do for just 5 girls growing 4' in total

yeah the concentration would be any different, they would still have the same needs, it may seem expensive in comparison to what you are doing now, but with growing you do get out what you put in,

my setup grow nutes $60 = 133 res fulls
bloom $60 = 133 res fulls
boost = $60
electricity for all periods of growth and electronic items, 200$ for 3 months
medium for all plants $70

total cost $450 per grow

average yield out put 32 ounces of premium dried herb worth $7000 (worked out at a rough cost of $3500 per lb)

oh yeah under what kind of light and are u lollipoping them?