Technical
Water Quality and Milking System Cleaning: What You Need to Know
Water Quality: The Invisible Variable in Milking Circuit Hygiene
Most dairy farm managers know their milking system cleaner and their cleaning schedule. Far fewer know their farm water hardness. Yet water quality — specifically mineral content — may be the single biggest variable determining whether a milking circuit cleaning program actually keeps the circuit clean.
This article explains how water quality affects cleaning outcomes and how to adjust protocols to compensate.
Water Hardness and Its Effects
Water hardness is caused by dissolved calcium (Ca²⁺) and magnesium (Mg²⁺) ions. It is measured in ppm (parts per million of CaCO₃ equivalent), in German degrees (°dH), or in English degrees (°Clark):
| Classification | ppm CaCO₃ |
|---|---|
| Soft | 0–100 |
| Moderately hard | 100–200 |
| Hard | 200–400 |
| Very hard | >400 |
Many agricultural water sources in AgroLyne's target markets are hard to very hard — this includes large parts of Uzbekistan, Iraq, and Morocco's inland zones.
Effect on alkaline cleaning: calcium and magnesium ions react with the sodium hydroxide in alkaline cleaners, precipitating out as calcium hydroxide deposits. This reduces the effective alkalinity available for cleaning and can leave deposits on circuit surfaces.
Effect on mineral deposit formation: during the alkaline wash cycle at temperatures above 60°C, dissolved calcium and magnesium from the water (combined with any residual milk calcium) precipitate onto circuit surfaces as scale and milkstone.
Effect on acid descaling: this is where hard water operations must be most diligent. The acid descaling cycle removes the mineral deposits that hard water washing creates. The harder the water, the more mineral deposits form, and the more frequently the acid descale must be run.
Practical Protocol Adjustments for Hard Water
Increase acid descaling frequency: in very hard water areas (>300 ppm CaCO₃), daily acid descaling is justified. MS CID or CLS CID acid descalers are formulated for regular CIP use.
Consider water softening for the CIP circuit: a point-of-use water softener for the CIP system can significantly reduce mineral deposit formation and extend the interval between acid descaling cycles. This is a capital investment but pays back in reduced product use and better cleaning outcomes.
Use stabilized cleaners in very hard water: STAB AC (alkaline) and STAB AD (acid) stabilized formulations contain chelating agents that sequester calcium and magnesium ions, reducing precipitation during the cleaning cycle.
Contact AgroLyne to discuss cleaning protocol adjustments for your specific water quality conditions.