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  #1  
Old 12-21-2015, 03:00 PM
Kon Kon is offline
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Should I filter rain water?
Default Should I filter rain water?

Hello everyone.

I've heard rain water is good for orchids and collected a bucket of it last week. When i poured rain water into a clear class jar I notice a lot of small almost transparent debris in it as well as small amount of dirt.

Should I use it as it is or clean it before using?
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  #2  
Old 12-21-2015, 03:21 PM
Orchid Whisperer Orchid Whisperer is offline
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It is not essential that you filter it (after all, that debris is in the water that orchids in nature would receive).

I do filter mine, though. That is mostly because I deliver the rain water to the plants with a pump sprayer. (I don't want to clog the pump sprayer). If I was just using a watering can, I would not bother filtering.
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Old 12-21-2015, 03:31 PM
Kon Kon is offline
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I see.
Thank you orchid Whisperer for advise.
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Old 12-21-2015, 03:47 PM
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I have a setup that collects rain water from my roof. I have a diverter valve so the beginning of a rain can wash away any crap on the roof. After it's rained a while I open the valve to fill my storage container. I fabricated a pre-filter from a 5 gal bucket that I keep pond filter pads in to keep the worst out. That said, my storage container hosts a population of Ceriodaphnia which must have hitch hiked onto the roof on a bird as eggs and been washed in. There's always little bits of stuff floating in it as well, but this does no harm to the plants or fish I use the water for.
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Old 12-21-2015, 03:52 PM
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Thank you Subrosa for info.
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Old 12-21-2015, 04:46 PM
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I would speculate that the detritus one collects in an urban environment is entirely different from that in a forest. I'm not saying it's bad, unless the local air is polluted, of course, but it is different.
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Old 12-21-2015, 09:11 PM
tucker85 tucker85 is offline
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If you water your orchids with rain water, make sure you supplement your fertilizer with calcium and magnesium. Some fertilizers do not contain those nutrients because the manufacturers know that those nutrients are often in the local water supply. Orchids that don't get enough calcium will be very susceptible to fungus infections.
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Old 12-22-2015, 08:25 AM
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Quote:
Originally Posted by tucker85 View Post
Orchids that don't get enough calcium will be very susceptible to fungus infections.

And the death of the tips of new growth.

Good addition, Tucker. Unlike most nutrients, calcium (and boron, maybe others) is not very mobile within plant tissues- once absorbed and used, it cannot be shared with new growth if the external supply is lacking, so it's a good idea to use a fertilizer formula or supplement to keep it supplied.
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Old 12-22-2015, 10:10 AM
Orchid Whisperer Orchid Whisperer is offline
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The debris filtered out of my rainwater is often an odd mix. Leaves, pine needles, bits of bark, chips of whatever the neighborhood squirrels have been eating in the trees seems to end up caught in the filter. Also random unidentifiable grit.

Occasionally odd things find their way in. I recall once having countless tiny, molted spider exoskeletons trapped in the filter. Probably a cohort of baby spiders hatched at the same time in a nearby tree, and were all molting at the same time.

None of this is harmful stuff. Ray is right though, it is probably different from what you find in forests.
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Old 12-22-2015, 12:49 PM
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I dig out any leaves or large debris but, otherwise, I don't worry about stuff in the water too much.
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