In 25K gallons of water, each 6 ounces of dichlor you add should raise your FC by approx. 1 ppm, so you can start using that instead of the bleach. For every 10 ppm the dichlor gives you, you're going to raise your CYA by 9 ppm, so I would test for that at least weekly, and then stop using the dichlor when it gets to your target (we recommend 40-50 ppm for most pools). Also, keep an eye on your pH--you're already at the lowest end of the acceptable range, and the dichlor is going to lower it more, so I would add some Borax to get the pH back up to the mid-7's range.
Janet
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