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Alternative to Hydroguard

From a reviewer: "This product is 10 to the 10th power CFus/mL, 10 Billion CFUs/mL. So at the rate of Hydroguard's application, 2 ml/gal- i would have 6 million CFUs in 300 gallons. So even with 1 milliliter of this product in 300 gallons it's 1600x stronger than hydroguard."
 
If a quart of Hydroguard is around 23 bucks and this is 1600 times stronger than Hygroguard....you do the math....
 
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