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It's fine to drink filtered water. There is nothing "good" in water that you need which can't be replaced by normal food. Except maybe flouride.

I wouldn't use it passed 006 as the filter isn't then working properly and has absorbed as much as is recommended to be considered zerowater. The filters are cheap enough and easy to replace so it really is a false economy to go beyond that, and the only way you will find out at what level above that is safe will be when you get dead shrimps - it's not worth the gamble in my view! Simon

Oh no, don't use that water than. Or convert the barrel by covering it with nylon mesh (fly screen). If you are not sure how polluted the rain water is around you, collect some in a clean container, and check the TDS. Anything less than 5 TDS is clean and safe to use in aquariums. Collect it out in the open to get an accurate readout, cause as soon as it hits the roof and gutters, TDS goes up.

I agree, I'm not sure the quality as a filtered water, I never even drink out of it, I always drink bottle water. As for the filtered water at 006, it still can be used, and it still filtered water, so even at 006, it should be ok for a while. You can even buy from amazon, the prices do vary. I'm waiting for delivery for a 10 cut jug and 3 replacement filter from www.taobao.cn, the prices is slightly cheaper that purchase 3 replacement filter on it's own.