Off-Grid and No Electricity

Use a liquid pH test kit or pH test strips. Both work without power: you compare a color against a chart. Liquid kits made for hydroponics are usually easier to read in the range that matters for growing. Liquid Test Kits Put a small sample of solution in the test...

Yes. Rainwater collected from a clean surface and stored covered works well for Kratky. It’s naturally low in minerals, so your nutrients make up most of what’s in the solution. You still need to add a complete hydroponic nutrient. Why Rainwater Works Tap...