I thought amylase worked at higher temperatures, like 145F to 155F. It works in this case at lower temperature to convert break down complex sugar?

Alpha Amylase works at 155f. This has Glucoamylase (Beta Amylase), which works at fermenting temp.

Does this yeast produce any esters or phenols ? Seems like rum might benefit from the flavors produced by a wit or abbey yeast.

I am not sure what the yeast produces. I think it produces a mild flavor so that the rum does not get overpowered. Having said that, the yeast reacts rapidly with the sugars and produces a high proof wash. It produces excellent yield and the finest high quality rum I have ever tasted.

would this make a ten gallon batch

The package says 6.6 gal. If you are doing 10 gallon it will just take longer to convert the sugar.

What is the Optimum temperature?

Between 25 to 30 degrees celsius or 77 to 86 degrees Fahrenheit

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FermFast Rum Turbo Yeast 107.5 g Packet

Product ID: 33603952

Details

Brand
Home Brew Ohio
Item Form
Powder
Item Weight
107.5 Grams
Number of Items
1
Unit Count
3.79 Ounce

⚡Rapid 3-day fermentation

🔥Up to 15% ABV power

🧪Glucoamylase enzyme boost

91 Lei

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Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍹 Brew Bold, Brew Fast — Own the Rum Game!

SPEED DEMON - Complete fermentation in just 3 days at 68°F—no waiting, just winning.
CLEAN PURE - Urea-free and vegan-friendly for a healthier, cleaner fermentation process.
MAXIMIZED YIELD - Includes glucoamylase enzyme to convert dextrins into extra fermentable sugars, boosting your final volume.
PERFECT BLEND FORMULA - Optimized for 50:50 molasses and sugar wash, or 100% sugar for versatile brewing.
TURBOCHARGE YOUR BREW - Ferments up to 15% ABV for bold, high-proof rum in record time.

FermFast Rum Turbo Yeast 107.5 g Packet is a high-performance active dry yeast designed for rapid fermentation of molasses and sugar washes, achieving up to 15% ABV in about 3 days. Enhanced with a glucoamylase enzyme, it maximizes sugar conversion for superior yield, making it the go-to choice for home brewers seeking fast, potent, and clean rum production.

Specifications

ASIN	B01EJSYI5Q
Age Range Description	18+
Best Sellers Rank	#98,004 in Grocery & Gourmet Food ( See Top 100 in Grocery & Gourmet Food ) #70 in Active Dry Yeasts
Brand	Home Brew Ohio
Brand Name	Home Brew Ohio
Coin Variety 1	Yeast
Color	White
Container Type	Packet
Cuisine	Caribbean and Latin American cuisines
Customer Reviews	4.6 out of 5 stars 345 Reviews
Global Trade Identification Number	00888690023062
Item Form	Powder
Item Package Quantity	1
Item Package Weight	0.11 kg
Item Weight	107.5 g
Leavening Agent Type	Active Dry Yeast
Manufacturer	Home Brew Ohio
Model Number	HOZQ8-390
Number of Items	1
Number of Pieces	1
Part Number	HOZQ8-390
Size	3.79 Ounce (Pack of 1)
Specialty	Vegan
UPC	888690023062
Unit Count	3.79 Ounce

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