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Direct Salt Addition Calculator

* Special thanks to Boomer from www.reefcentral.com for his help.

This calculator estimates the weight and volume of salt required to increase salinity to a target level. You should always exercise caution when adding salt directly to an aquarium: add only small amounts at a time and in an area away from invertebrates or fish. If mixing up new saltwater, set "Current Salinity" to 0 ppm.

Tell Me About Water Impurity in Salt Mix

All salt mixes contain some water content. If 35 grams of a given salt mix are collected, typically 3 - 7 of these grams turn out to be water. The water impurity in salt mix varies by brand but even within the same brand varies by batch and how long the salt has been exposed to atmospheric humidity, so it is not possible to accurately present a table of salt mix brands and their water impurities.

For the most accurate results, measure the water content of your salt mix yourself by adding 35 grams of salt mix to 965 grams of RO/DI water and measuring the resulting salinity in parts-per-thousand. Subtract this number from 35 to get your water content.



Water Volume:
 

Current Salinity:
 

Target Salinity:
 

Temperature:
 

Water Impurity in Salt Mix:
 




Salt Weight Required:
 

Estimated Salt Volume Required:
 



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