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Old 05-06-2014, 03:00 PM   #1
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How often do you water change?

I have a 50 gallon tank with approximately 10 th 12 gallon sump. I have been doing 12 to 17 gallon water change each week. I was wondering what is the norm. My coworkers son does aquarium maintenance and he is doing water changes once a month. I thought maybe that is to long to go.
My tank loos nice, it is getting expensive buying water at the lfs. I'm considering buying a ro/di unit.


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Old 05-06-2014, 03:15 PM   #2
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Weekly water changes will keep unwanted levels lower and wanted levels higher in the long run. Just buy a ro/di unit to save you money in the long run. BRS sells some really nice units.
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Old 05-06-2014, 04:11 PM   #3
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I heard that when you use ro/di water you loose 2 gallons of waste water to make 1 gallon. Is this true a lfs told me this. Not to sure if it was the truth. Also how much time in advance can I make my saltwater, will it go bad if I have it made a week in advance?

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Old 05-06-2014, 07:43 PM   #4
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It depends on the unit. I make water up and mix the saltwater together 24 hours in advance.
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Old 05-06-2014, 08:09 PM   #5
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A rodi unit has a resin unit that works by forcing water through it, leaving only the H20 part, and creating "waste water" with the other stuff. the older the unit, and the more clogged the rodi gets, the more waste water is produced. Additionally, the more inefficient a unit is, the more waste water is produced. A really good unit usually has a 1 to 4 ratio, and BRS as a little add on that run the waste water back through a r/o unit to give you back some of what you loose, maybe bringing it close to a 2/3 ratio.
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Old 05-06-2014, 08:39 PM   #6
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Close:

The resin in the DI is not where the waste is made. That happens in the membrane of the reverse osmosis unit. The more waste water you produce, the longer the membrane will last as it is being flushed better. If your not on any water metering restrictions most RO units do recommend a 3:1 waste water ratio. By piping that waste thru a second RO unit you can double your efficiency (3:2).
However, most RO units also come with a valve for regulating (and flushing) the waste and can get as efficient as 1:1. However that will shorten the life of the membrane unless frequent flushing is done.
I run mine about 3-4:1 as I don't pay for water. Waste water feeds into a garden watering distribution net.
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Old 05-06-2014, 08:57 PM   #7
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Quote:
Originally Posted by Ingy View Post
Close:

The resin in the DI is not where the waste is made. That happens in the membrane of the reverse osmosis unit. The more waste water you produce, the longer the membrane will last as it is being flushed better. If your not on any water metering restrictions most RO units do recommend a 3:1 waste water ratio. By piping that waste thru a second RO unit you can double your efficiency (3:2).
However, most RO units also come with a valve for regulating (and flushing) the waste and can get as efficient as 1:1. However that will shorten the life of the membrane unless frequent flushing is done.
I run mine about 3-4:1 as I don't pay for water. Waste water feeds into a garden watering distribution net.
And there you have it. I love forums for exactly this reason, if you're not quite sure the answer will arrive in time. Only thing better is reddit. Over there you get your answer and 600 different stories and maybe a really terrible water color
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Old 05-07-2014, 12:18 AM   #8
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Thank you for all the information. I'm definitely going to put a ro/di unit on my list to get. I called the water department today and asked how much is a gallon of water. She said for example 748 gallons of water would cost me $1.38. Wow I see how buying a unit would pay for itself. I'm going to check out BRS. I love this forum.

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Old 05-08-2014, 04:33 PM   #9
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I tested my water last night.
Alkaline 6.0.
Mag 1200
Calcium 400.
I don't understand why my parameters are so low. I did a large water change last Friday 5 days ago 20 gallons. I do weekly wc should I be dosing in between wc.
I have in my tank
2 clownfish
2 green chromis
1 six line wrass
1 yellow head goby
Hermit crabs, snails
1 cleaner shrimp.
2 zoas
1 trumpet coral
1 kenna tree
1 xenia
1 flower polyp soft coral. I don't know it's name.
No hard corals.
I will be doing another wc this weekend.


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Old 05-08-2014, 04:35 PM   #10
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Oh yea I left out
1 Condy anemone.
I would greatly appreciate any advice.
Thank you

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