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hydromisc
Open hardware to measure EC and pH, drive pumps, and otherwise manage a mid-size hydroponic grow over Wi-Fi.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If RO isn't an option or you are committed to using tap water, you can look at this for some ideas: https://github.com/hydromisc/hydromisc/blob/master/doc/nutrient-design.md
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