When do I measure my TDS? - Page 2 - The Planted Tank Forum
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post #16 of 25 (permalink) Old 07-06-2013, 02:49 PM
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Unless you know exactly what's in the water (the solids) when you drop 100, then it's not safe.

If you have to drop that much, do it slowly. And be certain you aren't altering hardness too abruptly.
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post #17 of 25 (permalink) Old 07-09-2013, 12:56 PM Thread Starter
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so a safe drop would be 30 or 40 tds?

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post #18 of 25 (permalink) Old 07-09-2013, 03:29 PM
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Originally Posted by Aquatic Delight View Post
so a safe drop would be 30 or 40 tds?
My tank records lead me to believe the average TDS drop here (mineral) is in the 35 to 50ppm range and to date I've never had a critter problem I could attribute to osmotic shock. That drop only last a few hours to overnight at most as the minerals mix and content is restored.

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post #19 of 25 (permalink) Old 07-09-2013, 04:39 PM
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I to weekly water changes on Sunday morning, 50 gallon long using R/O water. I test before and pull out 10-15 gallons. TDS goes from 750 to mid 500s but it back to 700ish within an hour or so. I've been doing it this way for about 6 months with no issues. Fish are fine. PH, ammonia, nitrite, nitrate have all been consistant after the initial cycle.
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post #20 of 25 (permalink) Old 07-12-2013, 12:36 PM Thread Starter
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is there a mathematical equation to help figure this out?

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post #21 of 25 (permalink) Old 07-12-2013, 12:50 PM
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You're over-thinking this.

If you need to drop your TDS by a lot for whatever reason, do it slowly, over the course of several hours. Dripping new water into the tank that's got drastically different parameters (slowly dripping for a few hours) will alleviate many issues.
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post #22 of 25 (permalink) Old 07-12-2013, 12:53 PM Thread Starter
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haha i just thinking that i could use my math brain to figure out much i need to take out and add back to get to where my tds needs to be.... not for large wc but in general.

i feel like i'm just spit balling otherwise.

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post #23 of 25 (permalink) Old 07-12-2013, 01:12 PM
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If you want something more measurable in your head while dropping things, swap out 5% of your water.

Measure.

Then you'll know what the percentage of change will be when you remove X amount of water.

Either way, if you alter parameters super-slowly, you'll have fewer issues and won't have to worry as much.
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post #24 of 25 (permalink) Old 07-12-2013, 01:18 PM Thread Starter
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fair enough.

i had to return the meter yesterday. so i'm waiting for mine to come in the mail now.

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post #25 of 25 (permalink) Old 07-12-2013, 07:08 PM
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With the meter you will be able to spot check tanks quickly.

I check TDS more often than anything else, because with the meter it might take me 5 minutes to check the 11 tanks in the dining room. I have a small dry erase board on the rack that I keep track of the last 3 readings, which will show me if a tank is ramping up faster than normal. In those cases I break out the rest of the drop tests for closer inspection to see what is giving way.
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