// SECTION 02 — INSTRUMENT
Root-Temp DO Calculator
Dissolved oxygen ceiling from reservoir temperature, using the USGS DO-temp table.
// DO CEILING (SATURATION)
8.75 mg/L
OK — TYPICAL HYDRO RANGE
Source: USGS DO-Temp Table (freshwater, sea level, 100% saturation). Real-world DO is typically 70–90% of this ceiling without active aeration. Below 5 mg/L, hydroponic roots begin oxygen starvation within hours.