Seachem Betta Basics is more then your conventional anti-chlorine. Aside from just removing chlorine from the water, Seachem Betta Basics will also automatically regulate the pH to a proper 7.0. And this is why Betta Basics is the water conditioner you should have for Siamese Fighting Fish / Betta Fish.
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You can use Seachem Betta Basics up to 2 - 3 times a week even without water change. This is because Betta basics doesn't not only work to remove chlorine but also regulator pH. The dosage is from 1 cap per 4L to 1.25L. The more you use, the more it will regulate the pH. But keep in mind that if you don't have any aquatic plants in your aquarium do use the lower dose. This is because Seachem Betta Basics so contain some nutrients for plants as well.