TDS readings

Joined
17 Mar 2012
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1,332
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Dorset
I hope this is in the right place. I took a reading straight from the kitchen tap and got 265ppm. I then took a reading from the drinking water part of the tap that goes through an in-line Brita filter and got 185ppm. Any ideas on what the filter is actually removing. It’s not much but certainly something?
The meter is a H&M aquaPro.
 

Konsa

Member
Joined
20 Nov 2010
Messages
777
Location
Lostock Hall
Hi
The TDS is every ion present in the water.The actual reading is irrelevant as I dont know what exactly is in it .Actual reading matters only if U are adding minerals to RO water for examle in shrimp keeping.
Regards Konsa
 

dw1305

Expert
Joined
7 Apr 2008
Messages
10,469
Location
nr Bath
Hi all,
Any ideas on what the filter is actually removing. It’s not much but certainly something?
I've never used a Brita filter, but it looks like it has an ion exchange resin. Judging from the <"Brita FAQ"> think it is pre-loaded with potassium (K), so it will exchange a Ca++ ion for two K+ ions. If you have hard water it will pretty soon be exhausted.

Because it has reduced conductivity it must have sequestered an ion as well, this could either be a cation or an anion. This would be via a DI resin which will swap a hydrogen (H+) ion for cation (like Na+ or Ca++), or a hydroxyl (OH-) ion for an anion (Cl-, SO4-- etc). Add together a H+ and a OH-, you have H2O and you've reduced conductivity.

Sounds like it is probably a <"mixed bed resin">.

cheers Darrel
 

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