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Can't comment (don't have enough reputation).

It all depends on your pre filters too.

My RO/DI unit has a sediment filter -> carbon filter -> RO membrane -> DI resins.

If you have the carbon filter you should be ok filtering rain water through your RO unit.

Also keep in mind Ro filtering works if you have proper pressure: 60 PSI is best.

So you will need a booster pump for it.

This article might shed some more light on the bacteria removal (paragraph 5): http://www.purewaterproducts.com/articles/carbon

Seems between carbon and the RO membrane you should be fine.

This seems like a good choice: https://www.bulkreefsupply.com/brs-universal-carbon-block-filter-1-micron.html

It all depends on your pre filters too.

My RO/DI unit has a sediment filter -> carbon filter -> RO membrane -> DI resins.

If you have the carbon filter you should be ok filtering rain water through your RO unit.

Also keep in mind Ro filtering works if you have proper pressure: 60 PSI is best.

So you will need a booster pump for it.

This article might shed some more light on the bacteria removal (paragraph 5): http://www.purewaterproducts.com/articles/carbon

Seems between carbon and the RO membrane you should be fine.

This seems like a good choice: https://www.bulkreefsupply.com/brs-universal-carbon-block-filter-1-micron.html

Can't comment (don't have enough reputation).

It all depends on your pre filters too.

My RO/DI unit has a sediment filter -> carbon filter -> RO membrane -> DI resins.

If you have the carbon filter you should be ok filtering rain water through your RO unit.

Also keep in mind Ro filtering works if you have proper pressure: 60 PSI is best.

So you will need a booster pump for it.

This article might shed some more light on the bacteria removal (paragraph 5): http://www.purewaterproducts.com/articles/carbon

Seems between carbon and the RO membrane you should be fine.

Can't comment (don't have enough reputation).

It all depends on your pre filters too.

My RO/DI unit has a sediment filter -> carbon filter -> RO membrane -> DI resins.

If you have the carbon filter you should be ok filtering rain water through your RO unit.

Also keep in mind Ro filtering works if you have proper pressure: 60 PSI is best.

So you will need a booster pump for it.

This article might shed some more light on the bacteria removal (paragraph 5): http://www.purewaterproducts.com/articles/carbon

Seems between carbon and the RO membrane you should be fine.

This seems like a good choice: https://www.bulkreefsupply.com/brs-universal-carbon-block-filter-1-micron.html

Can't comment (don't have enough reputation).

It all depends on your pre filters too.

My RO/DI unit has a sediment filter -> carbon filter -> RO membrane -> DI resins.

If you have the carbon filter you should be ok filtering rain water through your RO unit.

Also keep in mind Ro filtering works if you have proper pressure: 60 PSI is best.

So you will need a booster pump for it.

Can't comment (don't have enough reputation).

It all depends on your pre filters too.

My RO/DI unit has a sediment filter -> carbon filter -> RO membrane -> DI resins.

If you have the carbon filter you should be ok filtering rain water through your RO unit.

Also keep in mind Ro filtering works if you have proper pressure: 60 PSI is best.

So you will need a booster pump for it.

This article might shed some more light on the bacteria removal (paragraph 5): http://www.purewaterproducts.com/articles/carbon

Seems between carbon and the RO membrane you should be fine.