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Old 06-08-2004, 04:48 PM   #11
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Yeah Hanna is a good brand.. I used to have a pH meter by them that mysteriously disappeared. I'll probably replace it with another Hanna when funds permit.
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Old 06-09-2004, 02:16 PM   #12
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with my kinetico RO filter it uses the patented Everclean rinse system which actually rinses the membrane and makes it so i dont have to replace the membrane for ten years.
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30 gallon SW tank;EHEIM ECCO 2235 Canister Filter w/Miracle-Working Chemi-Pure
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Old 06-10-2004, 07:04 AM   #13
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I just measured the TDS in my RO water and it read 60ppm which is ok. And the SW in my main tank reads 650ppm. What TDS value should we expect in the main tank?
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Old 06-10-2004, 08:57 AM   #14
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There's really no point in measuring the TDS in the tank.. it will more often than not be off the scale anyway.

Also, 60ppm is quite high for RO water.. my tap water is only a bit more than that. You need to retest it making sure to use a very clean cup. IMO when the readings start to climb over 20-30ppm consistently, you need to change the membrane.
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Old 06-10-2004, 09:05 AM   #15
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Ok, my RO water might be contaminated because I used a sample from the water butt which I have been mixing SW with. I'll check it again. However, my tap water reads 440, and that is London water. And you know what London water is like.

So a high TDS in the tank is expect, right?
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Old 06-10-2004, 09:07 AM   #16
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Hehe, you need to move to Manchester :P

Yep, it's normal for the TDS to be very high in the aquarium.
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Old 06-10-2004, 09:24 AM   #17
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Yep, thats where you can make a decent cup of tea

And thanks for the info!
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Old 06-10-2004, 09:55 AM   #18
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ANything in the water will affect the TDS measurement. So unless your sampling container (cup) is extremly clean you can end up with a false reading.

Having a tank with very low TDS would surly spell disaster. As this would imply low salinity and low levels of the essencal trace elements. It would also imply next to zero bactera in the water as well as next to zero suspended waste.
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