Pacific Ocean | Raw Sea Salt Source

Dominion Salt is one of the few companies in the world to use seawater as a base material for Pharmaceutical Grade Sodium Chloride. Seawater from the great Southern Oceans is drawn into our solar salt fields in the first step of the process of manufacturing high purity Sodium Chloride. We believe this is an advantage, to be able to control the process of creating the raw material to the end product, from start to finish. This raw material utilises natural New Zealand resources in a process that is sustainable and environmentally friendly.


Sea Salt / Solar Salt Field Location

Our salt fields are located at Lake Grassmere, situated in the Marlborough Province of New Zealand. Marlborough is renowned for receiving more than its share of sunshine.

It was this meteorological feature, coupled with strong, drying Nor’ westerly winds and large areas of suitable flat land, that persuaded the late George W. Skellerup to establish his solar salt works in 1943.

Seawater contains just over 2.5 per cent sodium chloride, together with significant amounts of other salts. Large volumes of sea salt are harvested from Lake Grassmere each year. Sea Water is pumped into the 688 hectare main lake continuously through summer.

As Nature does its work and evaporation increases the sea waters strength, it is pumped into a series of concentrating ponds where further evaporation takes place. When the brine reaches saturation point it is transferred into crystallisation ponds during the summer months. The salt crust is lifted from the bottom of the crystallisation ponds and transported to one of the two washing plants where it is washed into brine before being stacked in 20 metre high piles.

The snowy stacks of salt are something of a landmark, readily visible by day and night from the Blenheim-Christchurch highway. Salt production is highly dependent on low rainfall and evaporation so it is necessary to hold large stockpiles of salt to counter the fluctuations in annual production.

Solar Salt is then used as the raw Material for saturated brine required for Producing Pure Dried Vacuum (PDV) Sodium Chloride.

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Fine Sea Salt


SEAWATER = Lower impurities and lower heavy metals in the finished product

Dominion Salt – Producers of Premium Pharmaceutical Grade Sodium Chloride