How Water Quality Affects a Harvest. 

There are many “best practices” when it comes to growing cannabis, and we’d like to discuss how growers can increase their harvest yields by growing with high-quality water. 

Surprisingly, water is often overlooked as a principal component of growing cannabis. However, just because water is safe to drink doesn’t mean it’s safe for growing plants. 

Water is the conductor of nutrients, which gives the plant its stiffness and lushness and plays a significant part in photosynthesis. 

Poor water quality means this natural process may be delayed or prevented, which ultimately affects your harvest’s yield. 

Here’s a list of common water quality issues growers face. 

Chemicals & Heavy Metals

Chemicals and heavy metals can be detrimental to cannabis. Heavy metals such as arsenic, nitrates, chlorine, dioxin, lead, and many can gather in parts of the body, and once they’re contaminated, it’s hard to reverse. 


Water systems with catalytic carbon and granular activated carbon filtration will significantly reduce chemicals and heavy metals. In addition, these filters successfully remove chloramine added by water treatment facilities. 


All water contains some form of bacteria which could be harmful to cannabis plants. By disinfecting to prevent potential bacteria contamination, your harvest could produce up to 35% more plants. 


 Ultraviolet Disinfection (“UV”) and Quantum Disinfection (“QD”)methods will destroy the harmful bacteria. 

Total Dissolved Solids

Total dissolved solids, or “TDS” for short, measure the levels of cations and anions in the water. If not adequately filtered out, these minerals could potentially affect your harvest. 


Reverse osmosis strips out 98-99% of all the minerals (cations and anions), leaving just pure H2O. At that point, you will need to add nutrients before watering your plants.


pH levels of 5.5 to 6.0 for vegetative stage & 6.0 to 6.5 for flowering stage are the most

favorable conditions for plants.


 A pH controller will help adjust and monitor pH levels. 

Looking to improve your grow’s water system? We’ve got you covered.