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Apologies for posting again in such a short amount of time but I have run into a bit of a problem, recently I've collected about 5 litres of rain water in a large barrel by simply redirecting the rain that falls from my roofs drains and my roof itself. My question is, is there a chance the rainwater may have picked up additional nutrients as it was running down the roofs pipe and the roof itself ?. Need advice as plants are arriving soon and that is the only rainwater I have collected :/

- Thanks a lot:)

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It'll probably be fine. I collect both from my greenhouse roof and house roof. Later marley tiles and plastic downpipes. The house roof is slightly higher tds. Can be a bit more dusty too at times but I've never had any problems using it for my CPs.  tds usually 20 to 30 compared to less than 20 off the greenhouse.

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6 hours ago, Dunc said:

It'll probably be fine. I collect both from my greenhouse roof and house roof. Later marley tiles and plastic downpipes. The house roof is slightly higher tds. Can be a bit more dusty too at times but I've never had any problems using it for my CPs.  tds usually 20 to 30 compared to less than 20 off the greenhouse.

That's a relief, however in noticed some moss growth in the drainage system and in the roof, would that be any reason for concern?

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If you are at all concerned about the water quality, buy a TDS meter from Amazon.  They cost less than £10 and will give you peace of mind.  Moss should not be a problem.  The only concern may be if you live in an industrial area where the rainwater may pick up contaminants in the atmosphere.  Otherwise you should be fine.

Rob

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As RobH says, TDS (and pH) meters are cheap essentials. A lot of my rainwater comes off the roof and has never been a problem. I also have an RO system for when water gets in short supply, a cheap used kit off the Bay.

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The books say you can use rainwater that's under 100 TDS without fear of problems

with your plants, mine comes off the greenhouse and garage roof and its 20-30 TDS

in different parts of the country their tap water is under 100 TDS and can be used

sadley my tap water is around 350 TDS so totally useless, as with many members

last summer was a complete washout no rain for weeks so I also bought a RO system

for a backup, so nothing to fear this summer, happy growing come on spring.

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