this is the next step of my project, but I have some note for this will update before weekend have to find in all my noteskccellall said:what about checking the ph and ec levels
here are some probe not to expensive
Conductivity sensor
https://www.cooking-hacks.com/shop/sensors/water-quality/conductivity-sensor
pH sensor
https://www.cooking-hacks.com/shop/sensors/water-quality/ph-sensor