My advice: Don't worry. I put it in and it doesn't harm the algae. With four days, 1/4 of the additive should be injected in the first four days, and the filter is only good for seven days - after seven days it should basically be disposed of. The addition didn't help and neither did the algae filter in my Biorba. I think it's better to spend money on a regular filter. I was really upset that it didn't work so I put some activated charcoal in the filter (after letting it sit for a week) and reused it to make my money out of it. Good cleaning with a white nylon pad and some elbow grease. Won't buy this again!
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