TDS & Water Change - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 10-06-2014, 03:24 PM Thread Starter
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TDS & Water Change

For the second week in a row the TDS reading in my 26B has increased dramatically from 103 to 940 after 20% water change. Last week when it happened took it about three days to drop back to normal.

Background: 20% weekly water change from tap
Tank fully cycled, heavily planted, sunsun 302 canister filter, DIY CO2; tank very clean, fish healthy
Fertilize using EI with no ferts on 7th water change day
Tap TDS: 240
PH 7.5
Amonia, Nitrate, Nitrite readings all zero
Water Change treated with Prime
I do NOT disturb the substrate when cleaning but do draw the water from the bottom of tank.
I do Not shut off the canister since I'm only doing 20% and it runs fine at that level. However, I'm thinking for some reason this is about the only thing that can account for the TMS increase. Canister was cleaned 36 days ago. Water is still crystal clear and flow is not reduced. As I'm writing this seems it almost has to be the canister. Think I'll clean it next week before water change and see of the TDS still elevates .

None of the actions of the fish seen to change, neon tetras & harlequin rasboras.

Not really concerned since the fish are doing so good but more curious than anything.

The wheel turns.

Last edited by DayOlder; 10-06-2014 at 03:43 PM. Reason: Additional Information
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post #2 of 10 (permalink) Old 10-06-2014, 07:14 PM
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That's weird. I wonder if something isn't leaching them back out into the water when the water becomes less saturated after a water change?

I've heard stories (rumors really) of carbon filters and the like doing this, though I was always under the impression that they only absorbed. Hmmm, I got nothing...
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post #3 of 10 (permalink) Old 10-06-2014, 08:08 PM Thread Starter
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Daximus, thanks for the reply. I have no carbon in my filter. I'm wondering if maybe by not turning my filter off and the water level dropping, my filter sets next to my tank, that perhaps the filter is reversing, water continues to come into the tank from the return while changing, and thus the filter is cleaning itself by dumping back into the tank. Although the tank water remains clean. Thinking as I'm writing. Anyway next week I'm going to clean the filter prior to the water change, then shut it off and then do the water change. I'm really curious to see if that makes a difference. If not than I'm lost but it won't be the first or last time. I'll also take a TDS reading before turning the filter back on.

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post #4 of 10 (permalink) Old 10-06-2014, 08:58 PM
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I suppose that is possible. At any rate, it's a testable theory! I don't own a TDS meter for this very reason, lol.





PS: Thanks for your service brother.
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post #5 of 10 (permalink) Old 10-06-2014, 09:43 PM Thread Starter
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Daximus, You are welcome. I actually agree with you on not owning a TDS meter. I got one when I started with shrimp but I can't remember why. Just playing around now I have accounted for some of the change. My tap water TDS is 240 but only if it cold, if I run only hot it jumps to 420. Obviously I warm my water to tank temp, 76 in my case, before water change so that explains part of the increase but no where near the 900 mark. Scary thought, my TDS meter only reads 3 digits, so what happens when it goes over a 1000? Maybe instead of dropping to 100 it is going to 1100. But if that is the case why is my water so clear and my fish doing so well. Again thinking why I type.

I actually had little choice. My father was a Marine who did 4 landings in the Pacific in WW2. My father-in-law was at Pearl Harbor when it was bombed and was suppose to get out the next day. He lived through the bombing but of course did not get out when expected.

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post #6 of 10 (permalink) Old 10-06-2014, 09:49 PM
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I guess I didn't realize that a filter could really contain TDS's like that. I mean, I know they hold dirty water...but I didn't know they were that efficient. I'd like to see you take a reading straight out of the nasty part of the filter.





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post #7 of 10 (permalink) Old 10-06-2014, 09:53 PM Thread Starter
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Oif?

Bump: No the hot water reading would have been due to the hot water tank having mineral deposits built up in it, I guess anyway.

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post #8 of 10 (permalink) Old 10-06-2014, 10:05 PM
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Yea, it makes sense that the hot water heater would be higher...calcium deposits and such. I just wonder if there is a readable difference between in your tank and in your filter.





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post #9 of 10 (permalink) Old 10-07-2014, 05:49 PM
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When you tested your "tap parameters" is that the reading straight out the faucet or out of a bucket you use to do water changes as you let time pass to let water acclimate? Storage container could be dirty. TDS= total dissolved solid as in you can't see the actual debris. That would explain the clear appearance of your water. I think TSS is total suspended solids which you can visibly see and should be taken care of by your mechanical filtration.

I would also love to know the TDS reading in your filter. Although good question on meter wether it's 100 or 1100.

Tanks, Tanks, Tanks, and more Tanks. oh, and i need another Tank i got a great idea...sounds about right?

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post #10 of 10 (permalink) Old 10-07-2014, 10:58 PM Thread Starter
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"Tap parameters" were from clean glass filled from tap, no settling time was added on. Cleaned the sunsun today, decided not to wait to Sunday, TDS was only a little higher than tank 948. Problem was in the filter, no let me restate that, problem was in me which caused the filter to be filthy. I have a memory problem, and that's putting it mildly. Anything over 60 seconds is long term for me and if I haven't written it down in that period of time it's lost. Long story short, from the filter I have been drastically over feeding the fish. The filter was a garbage pit. I'm thinking that after a water change the TDS reading was going over a 1000 but to me it looked liked a 100. The water looked clear, all my test readings were normal and the fish were happy. One thing I've learned is I can use the TDS reading to determine when the filter needs cleaning. The other is I have to keep better track on when I feed the fish.

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