TDS reading .01

K

Kay

My in-line tds meter is reading .01 going out. Does that mean the fiilters need changed? I have Marc's unit. I replaced the filters about four months ago, all of them, three RO and one DI. They said 0 till now. I can't tell when they need replaced.

Kay
 
Is that reading after your DI cartridge? If it is you could probably change out just your DI filter. It is really good to be able to get a TDS reading before your DI filter and after. The reason the DI cartridge will get used up a lot quicker than the RO membrane. But if your RO membrane starts going bad you will go through a DI cartridge very quickly. If you get a reading of your TDS before the DI it should be around 15-30 TDS depending on how high your TDS reading is right out of the tap. That reading should stay pretty constant until the RO membrane becomes used up. The TDS reading after the DI should be zero. If you notice the reading after the DI is going up with the reading before it remaining constant, then you will know the RO membrane is still good Then you should get a new DI cartridge and also replace your carbon filters and sediment block at this time. Replacing these is relatively cheap and will help your RO membrane last longer, which is the biggest expense.
 
My tds meter is after all four of them. Does the DI usually get used up faster than the RO? Last time I just replaced them all at once because I didn't really know which one was run out. Would it be all right to just replace them all periodically, like every three or four months? Is a .01 bad for water changes?

I guess I will have to get another tds meter. Thanks for your response.
Are you the Rick that gave me the orange cap? Thanks, it's doing really well. Are you bringing anything to the frag swap?

Kay
 
The RO membrane should last well over a year unless you going through one heck of a lot of water. The DI will go I guess about six months. You could change the other filters (the carbon and sediment filters) out when you change the DI. But changing out the RO membrane before it is used up would get pretty expensive for no reason. And the reading of 01 is nothing. You are certainly in no hurry to run out and get new ones yet. After it gets to 10 than start getting them replaced.
And I really do not have time this weekend to bring any corals.
 
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