Fritz RPM High Alkalinity Reef Salt

Fritz RPM High Alkalinity (the Redline red box) is a professional reef salt with all the major and minor elements of natural seawater plus enhanced alkalinity. The elevated alkalinity has been shown to support faster SPS coral growth, making it a favorite for SPS-dominant and heavily dosed reef tanks. Made in Fritz’s own facility in small, quality-controlled batches. Build your reef with corals and saltwater supplies.

Why This Salt

• Elevated alkalinity to support faster SPS coral growth
• All major and minor elements of natural seawater
• Made in-house in small, quality-controlled batches
• Ideal for SPS-dominant and heavily dosed reef systems
• Mixes fast and clear and dissolves completely

Target Parameters

Parameters reflect Fritz quality-control pass ranges with the median targeted. Your source water, especially its alkalinity, can affect the final mix.

How to Mix

• Mix with RO or RO/DI water for the most consistent results
• Add salt to water slowly with a powerhead running, never water to salt
• Mix and aerate until fully dissolved and clear
• Confirm salinity with a refractometer and target about 1.0264 (35 ppt) for reef tanks

Specifications

Pair It With

• Use the balanced Fritz RPM Reef Pro Mix for standard reef and fish-only tanks
• Confirm salinity with a refractometer and track calcium with the Fritz Calcium Test Kit
• Browse more salt mixes and corals

Frequently Asked Questions

How is this different from regular RPM?
It mixes to a higher alkalinity (about 10 to 11.5 dKH) versus 8.0 to 9.0 dKH for the standard blue box, which suits SPS and heavily dosed tanks.

Why higher alkalinity?
Elevated alkalinity has been shown to support faster SPS coral growth.

What water should I use?
Use RO or RO/DI water for the cleanest, most consistent mix.