Even if it rains, be sure you get out there and check your pool! Many people think that rains brings algae issues. In actuality, it is not the fault of the rain but due to nobody wanting to get wet and go out and check chemistry!
I'd wait until you have been using dichlor for a week to ten days before testing. You can kinda judge how much CYA is being added; for every 10ppm of chlorine that dichlor adds, it also adds 9ppm of CYA.
It is still safe to swim if the chlorine is a little high. Skin is pretty resilient, swim wear not so much. So, have the kids wear old swimsuits.
Report your chlorine level in the morning.
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