DSR Reefing calculator

Step by step: choose what you want to adjust, enter your reading, target, and volume, and you get a dose suggestion that matches DSR rules: do not go faster per day than the limit allows.

This is a planning aid only. Confirm big changes with your own mentor, test often, and follow your product label (strength, density, and how the supplier means “ml” or “g”).

Calcium (Ca)

Move calcium toward the target range.

Target: between 420 and 460 ppm (DSR).

Open calculator →

Alkalinity / KH

Adjust carbonate hardness (dKH).

Target: between 7 and 9 dKH (DSR).

Open calculator →

Magnesium (Mg)

Bring magnesium into the recommended range.

Target: between 1300 and 1400 ppm (DSR).

Open calculator →

Potassium (K)

Potassium offsets nitrate use — dose with care.

Target: between 380 and 420 ppm (DSR).

Open calculator →

Strontium (Sr)

Keep strontium in line with calcium and alkalinity work.

Target: between 3 and 10 ppm (DSR).

Open calculator →

Boron (B)

Boron: small, slow steps; a narrow room for change.

Target: between 3.5 and 4.4 ppm (DSR).

Open calculator →

Iodide (I)

Iodide is driven to a fixed DSR value — no separate target field; you only enter your reading.

Fixed target: 0.06 ppm (DSR).

Open calculator →

Manganese (Mn)

Manganese: very low target in ppb — work carefully.

Target: 0.4 ppb (DSR).

Open calculator →

Phosphate (P / PO4)

Phosphate as food — do not force a large jump at once.

Target: between 0.04 and 0.08 ppm (DSR).

Open calculator →

Nitrate (NO3)

Nitrate: feed slowly and stay in a safe band around the target.

Target: between 1 and 3 ppm (DSR).

Open calculator →

Iron (Fe)

Steer toward a (peak) target: no standard daily cap in the docs — you see the amount for the rise you ask for; split in smaller steps in practice.

Target: usually the “peak” in the method; enter your own goal.

Open calculator →

Magnesium sulfate (MgSO4)

In practice you raise magnesium with MgSO4. Multiply a “pure Mg” dose by about 1.21 (more salt for the same Mg). Enter your target sulfate to keep your sulfate plan in view.

Aim: Mg 1300–1400; sulfate follow-up per your own goal.

Open calculator →

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
Quick Links
About Us Contact Us
Follow Us
© 2010-2026 DSR Reefing, All Right Reserved.