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Storage Duration for Saltwater Mixtures: An BRStv Investigation

Saltwater mixers who rapidly utilize small batches typically don't need to fret about shifts in Alkalinity and Calcium levels. However, an increasing number of reef enthusiasts are preparing larger batches of saltwater less frequently, which may warrant caution on these parameters.

Storing Duration of Saltwater Mixture | BRStv Delves Into Investigation
Storing Duration of Saltwater Mixture | BRStv Delves Into Investigation

Storage Duration for Saltwater Mixtures: An BRStv Investigation

In a recent experiment, eight hobby-grade saltwater mix brands were put to the test to evaluate their stability during storage. The brands included Instant Ocean Reef Crystals, Instant Ocean Standard, Red Sea Blue Bucket, Red Sea Coral Pro, HW Reefer, Brightwell Aquatics NeoMarine, Tropic Marine Classic, and Tropic Marine Pro Salts.

Each salt mix was mixed to a concentration of 35 parts per thousand (PPT) or 1.026 Specific Gravity. The calcium and alkalinity levels were recorded immediately after mixing and at various intervals up to 3 weeks.

The results showed that the Red Sea Coral Pro salt mix showed the biggest change in levels throughout storage. This is due to its high saturation of calcium and alkalinity levels, which can lead to precipitation. Red Sea specifically instructs users to mix the Coral Pro salt for 2 hours (no more than 4), heat the water, and use it.

However, it's important to note that stable levels through storage can be expected with any of the salt mixes tested, making them suitable for storage or use with an auto water exchange system.

Changes in alkalinity were more noticeable than changes in calcium, providing a clearer picture of how each salt mix holds up to storage. The Saltmix brand showing the greatest alkalinity loss after 3 weeks of storage is typically the one with the highest moisture content and less stable chemical composition, as these factors accelerate the degradation of alkaline components.

Interestingly, changes in calcium levels were generally within the testing margin of error, with no substantial drops due to precipitation.

To mitigate evaporation and temperature swings when storing saltwater, it's recommended to store it in a cool, dry place and seal it tightly. However, the saltwater was mixed until it was visibly clear at room temperature, then left loosely sealed without any further water circulation or heat for the duration of the test.

For a more in-depth look at the results, check out the BRS Investigates video titled "Heated and circulated premixed saltwater storage, how long will it last? - BRStv Investigates". Additionally, a video testing the same salt mixes with added heat and circulation throughout the storage and testing process is also available.

To join the conversation about saltwater storage duration, users are encouraged to visit the R2R forum. If you're interested in winning some free aquarium goodies, sign up for our newsletter or follow us on YouTube and Facebook (#ASKBRSTV). We're always excited to hear from our community!

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