Reef-safe plastic storage containers

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Thinking about storage containers for topoff water, kalkwater, or for mixing up salt water for water changes.

According to Reef Central threads the Rubbermaid "Brute" storage containers are supposed to be OK ie. not leak chemicals/plasticizers into the water. Also I imagine the IO salt buckets would be OK.

Any advice on the types of plastic buckets/containers that are reef-safe?