Some things in the #4 Mix
PRODUCT PURPOSE
Designed specifically for growing indoor foliage crops, vegetables, herbs and other consumable crops.
BENEFITS OF AND RECOMMENDATIONS FOR THIS MIX
Indoor, exceptional drainage capabilities (peat moss, perlite and coir in mix)
Our “signature” mix for hydroponic growing situations
Dries out faster than some mixes that have more coir
TECHNICAL SPECS
pH 5.5 – 6.5
Soluble salts – 1.0 – 2.0 mmhos/cm
Nitrate N – 25 – 60 ppm
Phosphorus – 1 – 10 ppm
Potassium – 50 – 120 ppm
Calcium – 30 – 60 ppm
Magnesium – 10 – 25 ppm
I would not call that a soilless mix...