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Old 06-09-2014, 02:24 PM   #1
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How do I reduce TDS in water?

I bought a quick TDS tester, and for some reason I couldn't get a reading in my saltwater tank. All I got was 3 dashes: - - -

I am figuring I have something in there since I have a green algae bloom. Right now I was using R/O water from my home filter, which has a TDS of 19 ppm. Compared to my tap water at 185 ppm.

How can I clean up whatever is in my water?

Thanks!
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Old 06-09-2014, 02:31 PM   #2
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Many massive water changes with. 0 TDS RODI water.

You should be testing your tank with nitrate and phosphate test kits (along with many others) not a TDS meter. TDS meter is only used for water not mixed with salt.
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Old 06-09-2014, 05:13 PM   #3
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Your not going to get a reading in saltwater. The reason you won't zero from your ro/Di is so you don't have any contaminants. Once you add salt to your ro/Di water it will be off the charts.

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Old 06-09-2014, 05:13 PM   #4
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Quote:
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Many massive water changes with. 0 TDS RODI water.

You should be testing your tank with nitrate and phosphate test kits (along with many others) not a TDS meter. TDS meter is only used for water not mixed with salt.
Sorry Dave didn't see you up there lol

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Old 06-09-2014, 07:49 PM   #5
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TDS stands for total dissolved solids. Salt in saltwater is also a dissolved solid, just like nitrates, silicates, iron, or sulfate. Running the water from your tap through a ro/di machine to remove all solids from the water. This will ensure your water is as pure and pristine as possible, as many tap water is filled with either whatever your municipality puts into your water or even well/spring water full of many unknowns, to prevent algae growth and pristine coral growth.
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Old 06-09-2014, 09:09 PM   #6
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The answer is to change out all of your filters and especially your DI resin. Your outgoing water should be zero TDS or close to it.
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Old 06-10-2014, 12:37 AM   #7
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Quote:
Originally Posted by Magnus View Post
I bought a quick TDS tester, and for some reason I couldn't get a reading in my saltwater tank. All I got was 3 dashes: - - -

I am figuring I have something in there since I have a green algae bloom. Right now I was using R/O water from my home filter, which has a TDS of 19 ppm. Compared to my tap water at 185 ppm.

How can I clean up whatever is in my water?

Thanks!
The 19 ppm TDS will surely cause algae bloom. You need to install and add-on DI filter next to your RO filter and it will drop to 0 TDS.
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