Calculator / NaCl

NaCl

Measured and target salinity (ppt) are free inputs — this calculator does not enforce a band. Many reefs run ~33–34 ppt (DSR); if you are above target, use surplus correction % (default 35) to estimate litres to replace with lower-salinity water.

Raise salinity with sodium chloride (max 2 ppt/day), or estimate saltwater to replace when salinity is too high (surplus correction %).

Your inputs

Shown when measured salinity is above target. Default 35 %.

Other parameter

In a reef aquarium

Salinity (as practical salinity units / conductivity related to dissolved salts) sets osmotic pressure for fish, corals and microbes. Stable salinity reduces stress; large swings harm corals and can trigger RTN. Sodium chloride adjusts salinity when evaporation or freshwater dilution has lowered it — dose slowly, dissolve fully, and re-measure after mixing.

Quick tips

  • Use the same unit for reading and target (e.g. both ppm, both dKH for KH, or both ppt for salinity).
  • Volume = effective system water in liters (rough estimate is OK, but the cleaner the better).
  • For salinity below target, this plans salt raises (max 2 ppt/day). If you are above target, enter any lower target you want and submit: the calculator estimates litres of tank water to replace (NaCl surplus correction %).

Save time with our innovative products that eliminates the need for waterchanges in your aquarium. No more waterchanges means no more hassle, no more waste, and no more stress for you and your fish. Try it today and see the difference!!
Newsletter

Want to subscrive to our community newsletter for information about new findings or products?

Legal
Terms and Conditions Privacy statement Cookie policy
Our products
Salts Starterkits Trace Elements
Quick Links
About Us Contact Us
Follow Us
© 2010-2026 DSR Reefing, All Right Reserved.