Fritz Aquatics RPM Elements Part 1 Alkalinity Reef Aquarium Calcium Buffer – 16 Oz
Fritz RPM Liquid Alkalinity is a concentrated buffer (Part 1 of the RPM system) that raises and stabilizes alkalinity in reef aquariums. It maintains proper carbonate hardness (KH) and pH levels, supporting healthy coral calcification and overall water stability.
Product Specifications
| Component | Value |
|---|---|
| Product Type | Liquid Alkalinity Buffer |
| System Part | Part 1 of RPM System |
| Volume | 16 oz (473 ml) |
| Function | Raises and stabilizes alkalinity (KH) and pH |
| Application | Reef aquariums |
FAQ
How does this product help maintain stable pH in a reef tank?
This liquid alkalinity buffer helps stabilize carbonate hardness (KH), which in turn supports stable pH levels by buffering against rapid fluctuations in water chemistry.
Can this product be used in a freshwater aquarium?
No, this product is specifically formulated for reef aquariums and is not suitable for freshwater systems.
Is this part of a complete system?
Yes, this is Part 1 of the RPM system. It works in conjunction with other RPM components to maintain balanced water chemistry.

Steven Black –
Used this in my 50-gallon reef tank for three months. Alkalinity stayed steady even after water changes. Corals showed no signs of stress. Easy to mix and effective results.
Madeleine Abraham –
Good product for maintaining KH. It works well with the other RPM parts. I noticed a smoother pH curve after using it regularly.
Carolyn Fisher –
The buffer helped me keep consistent alkalinity levels during heavy fish feeding and water changes. Very reliable for reef stability.