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Reverse Osmosis unit?

KipperSarnie

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23 Jul 2016
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427
Location
Aldington Kent
New to modern Aquatics, a little knowledge is dangerous, I purchased a 4 stage RO unit, not happy with the flow I added another RO chamber that filtered the cleaning water from the first chamber, this reduced my waste water & upped the delivery of RO water.

So now I have a 5 chamber unit:
(1) Sediment Filter
(2) Carbon filter
(3) Reverse Osmosis Membrane 75lt
(4) Reverse Osmosis Membrane 120lt
(5) DI resin

Now I have a little more knowledge, so I'm a little more dangerous, I wondered if I really needed complete OR water changes?
So
I've added two taps to bypass the RO Membranes so the water is only filtered (1, 2 & 5 sections)
This gives me the choice of full RO water or just filtered water!

I've not done a full analysis but here are the TDS readings:

Tap water: 226ppm
Filtered water: 44ppm
RO water: 09ppm

Your views please!
Is it worth it?
Is there liable to be a problem because I'm missing something?
 

KipperSarnie

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23 Jul 2016
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Aldington Kent
Follow up:
This morning I have swapped (3) & (4) around so that the 120lt membrane is the main membrane & therefore the 70lt membrane scavenges the waste from the 120lt.

Tap water: 227ppm
Filtered water: 11ppm
RO water: 5ppm

I'm due a water change today so I'll check these figures after it's run a while as zero ppm RO water at the moment eludes me which could be due to the residue water in the filters.
 

Nick16

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13 Aug 2008
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Surrey, UK
I personally wouldn't worry about achieving zero. Mine hits zero after a filter change but slowly creeps up. After a year it hits 10ppm and i change the filters again, just as a precaution.

The main thing you are trying to achieve is to remove harmful metals and contaminants from the water and reduce hardness slightly.

My CRS tank needed a TDS of about 120-140. My tap water was 330. A few PPM here and there isnt much to worry about as you will just re-mineralise (sp?) to the correct levels anyway.

what are you trying to keep?
 

KipperSarnie

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Aldington Kent
Originally Discus but having visited breeders & specialist I'm non to happy with what the breeders have done with this majestic fish so Discus will have to wait till I've converted the fish room & buy wild or near wild stock.
The alternative was always Chocolate Gourami & other Asian black water inhabitants, except I also have a love of Keyhole Cichlids so bang goes the geographical tank idea!!:)
 

Chrispowell

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18 Apr 2014
Messages
358
The flow on an RO filter is restricted by the flow restricter.

If you wanted more flow you could get a taller filter with larger pods running on 3/8 pipe..

I used to use a float valve to fill up a container and then shut the water off. I then drained the tank and pumped the Ro water into the tank
 

GHNelson

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14 Dec 2008
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Hemel Hempstead
Hi
I have used RO in the past for a planted aquarium...not specifically for fish!
RO cannot be used neat.....it has to be remineralised in some form!
I cut the RO with tap water on a 3 to 1 unit ratio this was a good ratio for my needs!
Therefore you need to do some detective work regarding which parameters you would like to achieve!
Some information below!
RO USE!
hoggie
 

KipperSarnie

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Aldington Kent
The last time I was big into fish, 30 years ago, I lived in Lancashire with it's soft water. I used to prepare water for my fish in half a dozen dustbins with added peat (Now a bad word)
Back in Kent with it's hard alkaline water I was told RO water mixed with tap water was the way to go but as the water supply here is not the best I decided to add the option of full RO filtered water or filtered water, bypassing the RO membranes as required.

My reasons behind adding the second membrane was not only to increase the flow of RO water but also to cut down on the waste water. I now produce far, far less waste water!
 

Daveslaney

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21 May 2016
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Nottinghamshire
Used ro in the past also,Wouldnt worry to much about a zero TDS dont think i every achieved it either:)That was with a 300gpd unit.As been said you will need to cut it with tap water for use anyways.
Most Discus even high quality can be reared in tap water now days anyways.
If you want more ro production to waste water you need to look at boosting your incoming water pressure with a pump before your ro unit.
 

Nick16

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13 Aug 2008
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Surrey, UK
Dont cut it with tap water, defeats the whole point of having an RO unit. If you are trying to remove possible harmful substances from the tap water (metals etc), then why would you go and mix it with tap water afterwards?

Just buy some remineralising powder to get your water back to the desired levels. shrimp keepers do it with ease.
Can get KH or GH buffering powders (or both).

My RO unit consistently sits at 3-5ppm unless the filters need changing, at those levels the water is great to drink too, so much more pleasant.
 

Daveslaney

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Depends on the quantitys of ro your using i used to cut it with tapwater because i was using it to bring the tds levels down on a 6000 gal koi pond.:).
 

Nick16

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yes agreed, thats perfectly acceptable.
On a fish tank i wouldnt recommend doing it though. Difficult tropical fish like discus are more fussy than Koi. For the sake of another 25 litres or so, its not worth risking!
 

GHNelson

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Our lass said it was fantastic to clean the windows with too.
Left em streak free:);).
:lol::lol::lol: Very good!

Horses for Courses comes to mind.....just depends on your aquatic needs I suppose!......;)
 

Aqua360

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15 Feb 2016
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paisley
Originally Discus but having visited breeders & specialist I'm non to happy with what the breeders have done with this majestic fish so Discus will have to wait till I've converted the fish room & buy wild or near wild stock.
The alternative was always Chocolate Gourami & other Asian black water inhabitants, except I also have a love of Keyhole Cichlids so bang goes the geographical tank idea!!:)

Love keyholes, nice choice
 

Aqua360

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15 Feb 2016
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1,962
Location
paisley
Dont cut it with tap water, defeats the whole point of having an RO unit. If you are trying to remove possible harmful substances from the tap water (metals etc), then why would you go and mix it with tap water afterwards?

Just buy some remineralising powder to get your water back to the desired levels. shrimp keepers do it with ease.
Can get KH or GH buffering powders (or both).

My RO unit consistently sits at 3-5ppm unless the filters need changing, at those levels the water is great to drink too, so much more pleasant.

This interests me, do you really taste a difference? Is it healthy?
 

Nick16

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13 Aug 2008
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Surrey, UK
can taste a massive difference if you live in a hard water area. my tap was last recorded at over 300ppm!
 

Nick16

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Surrey, UK
Don't think it is considered healthy anymore.
Quite the opposite.

Its not considered healthy really, but it does taste nicer with alot less calcium in it. Especially cups of tea!
Water that comes out of our taps in this modern age is perfectly fine anyway.
 

dw1305

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7 Apr 2008
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nr Bath
Hi all,
Its not considered healthy really, but it does taste nicer with alot less calcium in it.
Strange isn't it, I really like the taste of our tap water (about 17dKH and 600microS). It is from a deep limestone aquifer and really clean, but hard.

To me soft water tastes like it is dissolving your tongue.

cheers Darrel
 
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