I guess I don't see what the problem is with testing.
You can add 1ml of your LC to 10 liters of tap water (5 x 2 liter soda bottles into a 5 gallon bucket) and it will give you the concentration.
The idea is that if you do the math, adding 1 gallon of LC to 10,000 gallons of water (or 1 liter of LC to 10,000 liters) the water's FC will be increased by exactly the concentration of the LC, whether it's regular bleach, ultra or LC (5.25%==>5.25ppm of FC, 6%==>6ppm of FC, 12.5%==> 12.5ppm of FC).
Scaling down to 1 ml of LC to 10,000 ml of water (10 liters) gives the same relationship. And 10 liters is 5 Coke/Pepsi bottles.
Just remember to subtract any FC the tap water has from you calculation.
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