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Rain water questions

Kelvin12

Member
Joined
16 Nov 2020
Messages
174
Location
NSW Australia
Some time ago I was home brewing and collecting water from a tiled roof. I was told by the "brewing experts "!!!! That silicone ? in the tiles effects the taste and I need to collect from an corrugated iron roof. I couldn't taste any difference.. Obviously if there is silicone in the tile collected water it doesn't effect the fish.

Dirk
 

ian_m

Global Moderator
UKAPS Team
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25 Jan 2012
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5,349
Location
Eastleigh
That silicone ?
I assume you mean silicon. Silicon is an element, usually around us in the form silicon dioxide ie quartz and is practically insoluble in water at normal temperature and pressures.

Silicone is an compound of silicon and organic molecules, used to seal sinks/baths and make rubber based compounds. Insoluble in water.
 

dw1305

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UKAPS Team
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7 Apr 2008
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13,976
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nr Bath
Hi all,
I would think concrete/cement based roof tiles would add extra hardness to the collected water compared to a proper slate roof or a greenhouse roof.
It has some effect, but much less than you might imagine, mainly because the rain-water is only briefly in contact with the roof.

cheers Darrel
 
Last edited:

Maf 2500

Member
Joined
5 Jan 2021
Messages
218
Location
Slade Dingle
Hi all,

It has some effect, but much less than you might imagine, mainly because the rain-water is only briefly in contact with the roof.

cheers Darrel
My roof is old (probably 1980's) and every time I clear the gutters of moss there are also significant quantities of course sand eroded from the roof tiles. The calcium carbonate has to be going somewhere and the runoff water seems the most likely candidate. Hopefully, as you suggest, the concentration is very low due to the large volumes of water over a year and the low contact times.
 
Joined
17 Mar 2012
Messages
1,652
Location
Dorset
I’ve never tested the rainwater I use apart from TDS. It’s collected from the roof of a large shed with a rubber roof. I’ve been using it for a long time now and the Fish, Shrimps and plants don’t seem to mind it. TDS when I last checked was around 50. The water butt is 210L. I have two of these but the other collects from our main roof which has what I think are clay tiles.
 
Joined
17 Mar 2012
Messages
1,652
Location
Dorset
You can some fancy water butts these days.

770682-CC-F21-E-41-FC-B726-B9-EDA32-AA44-F.jpg
 

dw1305

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UKAPS Team
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7 Apr 2008
Messages
13,976
Location
nr Bath
Hi all,
My roof is old (probably 1980's) and every time I clear the gutters of moss there are also significant quantities of course sand eroded from the roof tiles.
That should be fine. If you were getting physical lumps of cement (or mortar) in the water butt they would have more effect (because of longer contact time).

cheers Darrel
 

tam

Member
Joined
5 May 2011
Messages
1,253
Tested mine for you, the TDS was 48. Higher than I'd have guessed but I did just connect it and it's just got a downpipe straight off the main roof and has filled mostly from one down pour a month ago and a bit of drizzle so it's probably not very dilute. I think when I collected buckets mid pour it was closer to 30. I don't think the gh is very high though - haven't tested the rain, but I add about 40% hard tap and the tank is still only about 7gh so nothing near 5gh.
 

aquanoobie

Member
Joined
7 Apr 2022
Messages
71
Location
Canada
So, I have been using RO water for the past 1/2 year or so. but the waste is not really something I like.
Hi @plantnoobdude
Well, not usual but very efficient can be adjusting RO waste flow. First you collect water from clean and also from waste outlets and calculate ratio. Healthy ratio clean to waste can be 1 : 4 or 1 : 5. I have had up to 1 : 10, for every litre of clean water 10 litre was waste. It was totally unnecessary.

An easy remedy is to slap a valve on the waste water outlet and adjust it. It can be adjusted to your preferred ratio. Lesser waste makes the main RO membrane to end its life sooner but they are so cheap now it doesn't matter if it lasts a year less. I have had ROs running at 1 : 1 ratio at later stages, and new ones at 1 : 3 with no harm to their life span.

What kills the main membrane prematurely is insufficient carbon cartridge leaking chlorine.
 
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