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post #1 of 9 (permalink) Old 09-12-2004, 09:33 PM Thread Starter
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ro units

As I have very high KH & GH tap water I am considering mixing some RO water with the tap water to bring the KH down. My question to those of you that mix RO and tap water is what equipment do you use or do you purchase RO water?



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post #2 of 9 (permalink) Old 09-12-2004, 09:38 PM
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I dont do it, but it all depends on the size of your tank. With a 10 gallon, its alot cheaper to just buy 1 or 2 gallons of RO water and mixing with regular water, but with a 75 or something, buying a bare bone RO unit would save some mega bucks after long term use. What size tank do you have?
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post #3 of 9 (permalink) Old 09-12-2004, 09:44 PM
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My tap GH is 25 and KH is 22. I recently started diluting my 20 gallon with half tap half RO. I just go to the store and buy 5 gallons of RO water for $0.34 a gallon to dilute my weekly 50% water change.
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post #4 of 9 (permalink) Old 09-12-2004, 09:54 PM
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My GH is 10 and my KH is 19. haha My 55 gallon tank, I would kind of do this but i'm not sure. In my 12 I would. I am thinking about buying a barebone unit for 90$. Sounds like a good idea
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post #5 of 9 (permalink) Old 09-12-2004, 10:38 PM Thread Starter
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My tank is a 55 and GH varies between 18 and 23 Kh 18. I have a test meter to measure TDS and it is around 460ppm. There must be a whole bunch of other crap in there.

I just made a trip to LFS 5 gallons of RO water was 2.95 (.59 per gal). Too pricey for weekly water changes even when 50-50 solution.At that price it wouldn't take to long to pay for a RO unit.

What about the undersink units from the home stores?
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post #6 of 9 (permalink) Old 09-12-2004, 11:31 PM
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Thats what we had in our old house. It actually wasn't under the sink, but a tank and RO unit in the basement. It is simply too slow and costly to be using for a tank IME. The water comes out at about .3gallons/min. Plus the tank had a max volume of I think 15 gallons. So you could only take 15 gallons out at a time before it had to recharge. Thats just my experience - I'm sure someone here can help out.

Do you have a water softener? The reason your GH is fluctuating is because you might be using a mix of soft/hard water. If I use luke warm water my GH is 15. If I use cold water it is 25. Thats because water in the water heater is already softened. It is best to use your cold - 100% hard water and let it raise to room temp. The soft water has too much sodium.
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post #7 of 9 (permalink) Old 09-12-2004, 11:48 PM Thread Starter
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Yes I do have a softener and we soften all the water in the house hot and cold. When I get water for the tank I put the softener on bypass and let it run for awhile.

I just got back from the Lowes and they have a high capacity model for $193.00 22gpd with 2.5 gallon tank. Youre correct though output would be very slow though.

Doug
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post #8 of 9 (permalink) Old 09-13-2004, 01:02 AM
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Check at Aquabotanic.com. They just start selling RO units and are very cheap. If I buy another one, I would go there. The prices are very close to what you could get bidding on Ebay.

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post #9 of 9 (permalink) Old 09-13-2004, 01:18 AM
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I run an RO unit.

Anything less than 50 GPD is too little, in my opinion.

When figuring out the cost of an RO unit, you should also figure in the price of the membrane, carbon block, and the filter.

AquaBotanics price on RO units seems really good if you are interested in one. A 3 stage unit would be good, no DI is needed. Look for something around 50GPD and with a TFC membrane.

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