Hydro substrates are inert media that hold water and air but contain no nutrients of their own, so you feed everything through your solution. Right now this collection holds the Agra-Wool RFX-1 Mix, an Earthwool foam mix sold as a box of three 80 L bags. It's used loose in pots or containers and offers a consistent balance between water retention and drainage, which suits drip irrigation and frequent feeding. Because the medium is inert, accurate pH and EC control matters: use a meter from pH & EC meters. For other media, see substrates or coco substrates.
Questions & answers about Hydro Substrates
All growing questions →- Medium & pots Soil, coco or hydro: what should a beginner start with? Soil is the most forgiving. Coco grows faster but needs feeding and pH checks every watering. Hydro is the most demanding. Read the answer →
- Medium & pots What's the best soil mix for growing indoors? Go for a light, airy, pre-fertilised mix with roughly 20–30% perlite so water drains and roots get air. Garden soil is a bad idea indoors... Read the answer →
- Medium & pots How often should I water in soil and in coco? Soil: water when the pot feels light and the top 2–3 cm are dry. Coco: water small amounts often, daily or every second day in bigger pla... Read the answer →
- Medium & pots Can I reuse my soil after a harvest? Yes, if the last plants were healthy. Break out the roots, mix in fresh compost or amendments, and let it rest before planting again. Thr... Read the answer →
