Go ahead and bring them in. I buy 8-10 jugs at a time and keep them in my cool basement.

Here are a couple of ways to test the strength of bleach.

The first one was from AnnaK (one of our support team members who is no longer active on the forum.)
* add 10 ml LC to 1 L water, mix,
* add 10 ml of the mix to 1 L water, mix
* test using the 25 ml procedure multiplying the # of drops by 0.2.

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Here is how CarlD (another one of mods) tests his liquid chlorine:

Put ten liters of tap water ( That's 5 soda-bottles full) in a 5 gallon bucket.

Test that water for chlorine using the FAS-DPD test to get a chlorine baseline (you may have some).

Then I take a 1 ml eyedropper full of the LC or bleach I'm testing and put it in the bucket and mix it up.

(1 ml in 10 liters of water is the same as putting 1 gallon of LC in a 10,000 gallon pool -- it's 1/10,000th. )

I then measure the bucket with the FAS-DPD test just like pool water. Of course, subtract any chlorine you measured in the tap water.

I use a glass eyedropper so it will hold up. Pharmacies sell them.