What is powdery mildew? Powdery mildew is a fungal disease that can affect many plants including your favorite plants.  If left untreated, at best it will significantly reduce yields and at…

What does NPK mean and what is an NPK ratio?   NPK ratios, also known as grades, are a very loose guide or reference to the % of nitrogen, phosphorus and potassium contained within a fe…

What is ppm?  Parts per million (ppm) is the measurement of dissolved salts in solution referred to as Total Dissolved Solids (TDS).  Plant nutrients/fertilizers are generally essential soli…

H2O:  To Filter or Not to Filter! Water may seem like the simplest component of any hydroponic nutrient regime and is quite commonly overlooked, for this reason.  Water is actually one…

Silicon:  The Misunderstood Element What is silicon?  Silicon is perhaps more misunderstood and under-appreciated than any other element.  Widely viewed originally as an element no…

Summary 2-5ppm of free chlorine proves to be the minimum effective concentration. 5ppm free chlorine is the most efficacious for a wide variety of plant species. Levels as high as 20ppm…