What the tank eats each day, and exactly what to dose.

Two-part dosing is simple chemistry made confusing by a dozen product strengths and a tank volume nobody measured. This turns "alk dropped from 8.2 to 7.9 in three days" into "dose 0.72 g of soda ash a day, and 4.8 g extra tomorrow to get back to 8.5".

WHAT IT DOES

• Daily consumption of alkalinity, calcium and magnesium from a trend fitted across your recent tests (you choose how many), with a noise warning when the readings scatter
• Dosing pump schedule: doses per day in, millilitres per shot out
• 14-day projection: what alk and calcium will do under the daily dose plus the correction, charted against the target band
• Converts that into grams of the dry product you use, from molar masses, for your exact water volume
• Or into millilitres of a liquid product from the strength printed on the bottle
• Stock solution recipe: grams per litre and millilitres per day, capped by solubility
• Correction doses to reach target, split over days so you never raise alk more than 1 dKH, calcium 50 ppm or magnesium 100 ppm in a day
• Alk-to-calcium consumption ratio with a warning when it is far from the 1 : 7 a growing reef shows
• Test log with charts and target bands

Products built in

Soda ash, baking soda, calcium chloride dihydrate and anhydrous, magnesium chloride hexahydrate, magnesium sulfate, and any liquid supplement.

What you get

• The calculator (one .html file, runs in any browser, offline)
• A 2-page quick-start guide

Good to know

• One file. No install, no account, no subscription, no internet needed after download.
• Your data stays on your computer. Export a backup any time; import it on another machine.
• Works on Mac, Windows, Linux and iPad (open the file in Safari or Chrome).
• Instant download.

What's inside the download

• Reef-Tank-Dosing-Calculator.html
• Quick-Start-Guide.pdf