I used ammonia from the hardware store and it worked well. But that takes a lot more guesswork because you don't know the concentration of that ammonia or the size of the droplet per gallon of water. This product is strong, effective and does a good job of helping you get closer to more accurate readings. for a stress-free journey. Reason for deducting a star: It's hard to count the drops. When I first rotated the bottle to drip the ammonia into the tank, it should come out about 10 drops at a time without squeezing too hard, so be careful when using it for the first time. Get a picture of what the drop rate is depending on how much pressure you put on the bottle and then you can get the exact number of drops. Also, it's not foolproof. Test your water to see how your tap water chemistry interacts with the solution to give you an idea of how many drops per gallon you should be using. Every water and every tank is different.
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