Reef Essential® Signature Series™ / Rubidium
Signature Series™ · Single-Element Precision
Rubidium — for when your ICP test says you're low.
Ultra-pure, ICP-OES tested rubidium on its own — for closing a gap your water test just flagged, not for routine blanket dosing.
Why rubidium, specifically
What this element is actually doing in your tank, in plain terms.
Closing the gap to real seawater
Rubidium is an essential element found in natural seawater. To replicate natural seawater parameters as closely as possible, supplementation is highly recommended once your ICP test shows it running low.
A completeness element
Rubidium is found in natural seawater. The manufacturer recommends supplementing it to replicate natural seawater parameters as closely as possible.
Spread it over a week
The manufacturer recommends spreading the dose over at least one week, for consistency and to avoid sudden change.
When to reach for Rubidium specifically
Single-element dosing is precision correction, not a routine — here's how to tell if this is the bottle you need.
Your ICP test flags low rubidium specifically
Signature Series products exist to correct one number at a time — dose based on your actual test result, not a guess.
A blended maintenance product instead
There's no blended product carrying rubidium in the standard lineup — this is the direct route once your ICP test flags it.
Dosing
Dose according to your ICP test result, not on a fixed schedule.
| What you're doing | Effect |
|---|---|
| Per 100L (26 US gal) dosed | 1 mL raises Rubidium by 0.01 ppm |
| Recommended pacing | Spread the correction over at least 1 week |
| Target concentration | 0.03–0.05 ppm |
Rest of the Signature Series™
Organized by periodic table group — dose only the elements your ICP test says you're missing.
Questions about this product
Do I need to test before dosing this?+
Is there a blended product with rubidium in it, like the other elements?+
Can I use this after any ICP test, or only Quantum's?+
What's actually in the bottle?+
Got an ICP result to correct?
The dosing app turns your test numbers into an exact daily dose.
Order direct from Quantum