When is TDS to high to use?

[jordan10]

Thanks I ran my rodi all night by time I get home should have enough to do 20 25 gallon water change. I was just wondering what's is worse high TDS or high nirite

 

[William Mumford]

Thanks I ran my rodi all night by time I get home should have enough to do 20 25 gallon water change. I was just wondering what's is worse high TDS or high nirite

Both not 1 or the other. Maybe tds if I was forced to pick but depends on the levels of each its not apples to apples so it's hard to say. If that helps at all.

 

[windemerejack]

I'm sorry if it seemed that I was being rude. I just was really looking for recommendation for a tester because I'm trying to buy one that has a good track record.

Any inline meter is fine in my experience, as I said I change resin when it goes from 0 to 1, how accurate that is I don't know but as its gone to 1 something is showing up.
Don't waste your money on getting a lab quality test kit as the hobby ones are accurate for our needs.
You should be able to get a good inline tds meter for under a tenner

 

[Zoaologist]

Las Vegas NV tap water is ~700 tds lol

I’m in Las Vegas. I always have 200 gallons of RODI made up ready to go 0 tds if anyone needs some.

 

[vahegan]

Does that TDS=17 come straight from their RO unit, or after it stays in a bucket for some time? If you leave a zero TDS water in a bucket uncovered overnight, it will get quite some TDS value as a result of carbon dioxide dissolving from the air. Which is quite normal and will do no harm (actually, when making saltwater for water changes, I always bubble it with airstone for a few hours before filling into the reef tank, in order to saturate with CO2 and stabilise the KH value). If TDS=17 is measured straight of the unit, then it is time for them to replace the membrane. Not very much expense, I've got a 400GPD membrane for something like 50 bucks on Amazon.

With that, my RO (no DI) water comes at about TDS=7 right from the unit - which I was thinking is a bit high as I have set up a relatively high permiate/return ratio. I've got a 3-stage DI setup but too lazy to connect it yet...

 

[jordan10]

Does that TDS=17 come straight from their RO unit, or after it stays in a bucket for some time? If you leave a zero TDS water in a bucket uncovered overnight, it will get quite some TDS value as a result of carbon dioxide dissolving from the air. Which is quite normal and will do no harm (actually, when making saltwater for water changes, I always bubble it with airstone for a few hours before filling into the reef tank, in order to saturate with CO2 and stabilise the KH value). If TDS=17 is measured straight of the unit, then it is time for them to replace the membrane. Not very much expense, I've got a 400GPD membrane for something like 50 bucks on Amazon.

With that, my RO (no DI) water comes at about TDS=7 right from the unit - which I was thinking is a bit high as I have set up a relatively high permiate/return ratio. I've got a 3-stage DI setup but too lazy to connect it yet...

Yea straight from RO. Good idea with air stone.

 

[Ewok1]

I been trying to fatten my fish up and put auto feeder on and programed it wrong. And its been dumping to much food. Few corals not looking good. So test no3 and it's high round 50 Anyway need do water change to try bring down but don't have any rodi water made up. My LFS to water is around 17tds. So do I just wait till I can make my own water or should I try and lower no3 with the high tds?

0 tds for sure. Don’t trust your lfs and make your own water with RODI water.