You have a lot of ...

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You have a lot of suggestions already, but it will be nice if you know the quality of the raw rainwater before you decide on the type of treatment or combination of treatments to use.

Also, before chlorination, you need to do a chlorine demand test to give an idea of what volume of chlorine solution to use. Remenber, chlorination should be at low turbidity of 1-5 NTU to reduce the risk of chlorinationation by-products.

As somebody suggested, this may involve emptying the tank to ensure everything is in place before starting the treatment.

Good luck