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post #1 of 8 (permalink) Old 08-15-2014, 04:43 PM Thread Starter
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High TDS

Hey guys, I am running a 100 gallon tank, high tech with heavy CO2 injection and a daily Seachem Liquid Fertilizer routine. I use nothing but RO water at 20% per week. I just bought a TDS meter and it read 430. I'm curious, is it normal to have such a high TDS with Seachem ferts in the water column? I tested my RO and it's at 006. Everything in the tank is healthy including Otos, Shrimp, etc... any help would be appreciated.
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post #2 of 8 (permalink) Old 08-15-2014, 05:13 PM
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That reading seems high to me being your using only RO with 20% WC/week. Mine is just over 500 but I only use RO to top off with 20% tap water for WC/ week. Tap is about 200 and I do not inject CO2 only Excel daily. All my fish including Otos and Amano shrimp doing well. Tannins will give you a higher TDS reading and I've noticed as my driftwood ages my TDS reading is falling. It was around 650 at one point. The only ferts I use I are Excel daily and Iron every other day. I have a second tank where I only use RO water and it stays just over 200. It does not get any ferts and has no new driftwood.

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Last edited by DayOlder; 08-15-2014 at 05:16 PM. Reason: Spelling
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post #3 of 8 (permalink) Old 08-15-2014, 05:45 PM
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do you have any rocks in your tank? maybe its the one thats driving your tds up. you could do a simple test on that.
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post #4 of 8 (permalink) Old 08-15-2014, 06:09 PM Thread Starter
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Originally Posted by birbaliktanki View Post
do you have any rocks in your tank? maybe its the one thats driving your tds up. you could do a simple test on that.
I do have a few rocks. My substrate is Eco Complete. I also have two large pieces of drift wood. I'm guessing it's a combination of everything.
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post #5 of 8 (permalink) Old 08-15-2014, 06:52 PM
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Originally Posted by GardenVariety View Post
I do have a few rocks. My substrate is Eco Complete. I also have two large pieces of drift wood. I'm guessing it's a combination of everything.
you could put a piece of that rock in a pail filled with RO water. measure the tds initially and leave it after 2 days, then measure again. if it increases, then you found one of your culprits.
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post #6 of 8 (permalink) Old 08-15-2014, 08:36 PM
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That was how I figured out that tannins increase TDS. Put an Almond leaf in 8 oz of water and it increased TDS from 20 to 134 in three hours.

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post #7 of 8 (permalink) Old 08-15-2014, 08:58 PM
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Where in cali do you live? I dont remember exactly right now but I think my water strait out o the tap is like in the low 300 or high 200s lol


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post #8 of 8 (permalink) Old 08-15-2014, 09:09 PM Thread Starter
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Where in cali do you live? I dont remember exactly right now but I think my water strait out o the tap is like in the low 300 or high 200s lol
Yeah, I'm in southern california. Our tap water is 270. However, I don't use tap water.
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