Aquavitro Eight Four 1L


Aquavitro Eight.Four 1L (kH & pH Adjuster)



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Aquavitro Eight Four 1L

  • Supplies a properly balanced buffer system that yields an industry leading pK of 8.6 which makes pH maintenance of 8.3-8.5 easy

  • Safely raise marine pH while adjusting alkalinity

Many competing buffers for reef aquaria are simply sodium bicarbonate. Such buffers have a pK of only 8.0 in saltwater and simply are unable to maintain a pH above 8.0. The low buffering pK is a function of the low carbonate/bicarbonate ratio.

Eight.four supplies a properly balanced (carbonate/bicarbonate) buffer system that yields an industry leading pK of 8.6 which makes pH maintenance of 8.3-8.5 easy. A higher pK increases the buffer's ability to counteract inevitable acidic sources in the water. Eight.four will safely raise marine pH while adjusting alkalinity. Eight.four contains a concentrated, balanced blend of bicarbonate and carbonate salts designed to restore disrupted buffer systems and increase carbonate alkalinity.

If an alkalinity of 6 meq/L has been reached and a pH of at least 8.20 has not been attained, the system may be ionically unbalanced. Check magnesium levels. If magnesium is low, use ions. However, if magnesium levels are within optimal range, the buffer ratio has likely been disrupted (the buffer ratio changes as a natural consequence of the buffer's ability to counteract acidifying sources such as organic acids). You can raise pH without raising alkalinity using balance.

Unlike competing products that require multi-day interval dosing when combined with carbonate supplements, eight.four can be dosed daily and within minutes of our calcification as well as balance and ions


Dosing requirements will vary, but do not exceed the recommended dose without checking your pH and alkalinity (alkalinity should not exceed 6 meq/L). Use 5 mL for every 80 L (20 US gallons) daily until pH stabilizes to desired level.

pH stabilization may take from a day to a week, depending on original pH, alkalinity, and buffer system balance. Thereafter, use as needed to maintain pH.


The aquavitro cap offers multiple dosing solutions depending on the size of your system. Each inner cap thread is approximately 2 mL. The inner cap contains 7 mL, while the outer ring contains 28 mL (35 mL when both are filled to the level of the inner cap.) When filled to the top, the cap contains 49 mL.

Use Seachem's MultiTest: Marine pH & Alkalinity to check pH and total alkalinity. For a complete analysis of alkalinity, use Seachem's Reef Status: Magensium & Carbonate/Borate Alkalinity kit.


How much will one dose of eight.four™ raise my alkalinity?

A: Each 5 mL of eight.four™ added to 80 L (20 US gallons) (standard dose) will raise alkalinity by 0.25meq/L (or 0.7 dKH).

I am planning on using eight.four™ in my tank to boost my alkalinity. I see on the bottle that it says it safely raises pH to 8.4. Does this mean you cannot overdose this product?

A: While eight.four™ is certainly a very safe and effective means of adding alkalinity, overdosing is possible with any product. eight.four™ is blended in such a way that allows one to dose a significant amount more than the standard dose without overshooting pH above 8.4. However, your alkalinity can still be overshot causing issues with ionic balance. Significant overdosing of this product could potentially cause too high of a KH, thus resulting in issues with maintaining other parameters, namely calcium. It is always best to test your alkalinity before adding the product and use it as needed.

How do I know if I should use balance or eight.four to raise pH in my reef aquarium? Do they do the same thing?

A: No, these are actually two very different products. eight.four is a buffer that will raise both pH and KH (alkalinity) in your aquarium by adding a blend of buffering agents such as carbonates and bicarbonates to your system. balance specifically targets pH only by re-establishing the proper bicarbonate/carbonate ratio by using a hydroxide blend to raise pH without having an impact on KH, calcium or magnesium levels. If your calcium, magnesium and alkalinity are all in the proper levels but pH is still low, you can use balance to correct this. If calcium, magnesium and/or alkalinity is also low in addition to pH, then you may want to use eight.four in addition to other products in the aquavitro range such as calcification or ions to address any other deficiencies.


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