You really should be changing out the water more often, different stages eat more food and nutrients become unbalanced, u can add nutes in with water, but it's advisable to change the water at least every 2 weeks, if u use less water i would do it once a week. Depending on ur set up u can go very long with no res changes, aeroponics would be the longest, dwc should be the shortest. Keeping this balance can be a huge advantage. Watching your ppms is a big factor, keep an eye on how much water transpires and if the ppms drop, normally adding in the same ppms is a good idea, but at some point your going to hit an unbalance.
JackdaWack Reviewed by JackdaWack on . When topping off your rez....... I have read that when peeps top off their rez that the preferred method is to top off with plain PH water untill you have added back the same amount as your rez holds, my question is when topping off would there be harm alternating between plain and nuted water? Meaning you have a full fresh rez on Sunday, Monday you are down a gallon so you add Plain PH water. Tuesday you are down a gallon so you add a gallon of nuted water. next topoff you do plain again and so on until end of week or 10 days Rating: 5