tds readings

bacnberger · 04/21/2009, 08:22 PM

why do I get a tds reading of around 300 when I check the water directly in my 30 gal nalgene container (just cleaned and refilled with fresh ro water) but when I draw a sample from the spout at the bottom of the tank into a cup and test this it reads 2 tds. (the same as it reads directly from the ro unit) When I take the cup and scoop water from the surface of the the tank where I just had a reading of around 300 and test this it reads around 50tds. I'm really confused. i've been using this tank for around 5 years for top off and in the past few months have started to get excess nutrient problems in my tank. Any help would be greatly appreciated.

Mike

luther1200 · 04/21/2009, 08:25 PM

Have you calibrated your meter lately?

bacnberger · 04/21/2009, 08:28 PM

no, ran out of cal fluid but didnt think the meter would fluctuate this much if off some

04/21/2009, 08:22 PM	#1
bacnberger Registered Member Join Date: Aug 2001 Location: long island Posts: 170	tds readings why do I get a tds reading of around 300 when I check the water directly in my 30 gal nalgene container (just cleaned and refilled with fresh ro water) but when I draw a sample from the spout at the bottom of the tank into a cup and test this it reads 2 tds. (the same as it reads directly from the ro unit) When I take the cup and scoop water from the surface of the the tank where I just had a reading of around 300 and test this it reads around 50tds. I'm really confused. i've been using this tank for around 5 years for top off and in the past few months have started to get excess nutrient problems in my tank. Any help would be greatly appreciated. Mike

04/21/2009, 08:25 PM	#2
luther1200 Premium Member Join Date: Feb 2009 Location: NJ, shore Posts: 4,376	Have you calibrated your meter lately? __________________ Matt, 65G reef tank Current Tank Info: 65g reef, mix of sps, lps, few softies. Hoping to upgrade within the year.

04/21/2009, 08:28 PM	#3
bacnberger Registered Member Join Date: Aug 2001 Location: long island Posts: 170	no, ran out of cal fluid but didnt think the meter would fluctuate this much if off some