I'm not sure what you mean by "notice anything"...when the bleach is added, you probably won't notice any change immediately. After the bleach is in and has been circulating awhile with the filter running, you may, or may not, see the green color fading toward blue. Honestly, without a known CYA level it's really impossible to know whether that's enough bleach at one time to work on the problem or if it's just enough to keep the problem from getting any worse.
Janet
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