With true organics there is NO salt build up. Water till it seeps out the bottom. 10 to 20% run out is a selling point for nute companies. I water full nutes every watering. Never ph organics. The soil will do that. Get used to picking up your plants to feel the weight. Remember they are growing every day so their plant weight goes up a little every day. Water just less then you think and wait ten minutes. Is not seeping pick up and judge again. Then add some more then wait. Once a little seepage around bottom your done. If soil too dry it will run out faster then absorbing so don't be fooled by runout early. Pick up and recheck.
If not using silicone yet in water add it now and forever. 2 to 3 ml per gallon and add it first. If you under water and get leaf drooping it keeps it from shocking it. Also helps plant store more water for those times. Which makes stems larger for bigger yields.