Tap water EC

Not every EC “counts” , see : what’s important is NPK EC , the calmag EC is less important because it takes more of it to mess up. What you can do with the tap water is use a bubbler to bubble the water and try to reduce some of the chemicals inside it . Simple get an aquarium bubbler , and one day before the water use it in the water that you will water with. Just remember your base EC and try to keep it in mind when you measure your feed. So actually it should be okay, but you can do something, and most of all don’t forget that your water is quite “hard” . Hope this helps ! 🚀