High phosphates tap water
- Thread starter pandimus
- Start date
I don't believe so.
TDS is total dissolved solids, like iron copper, silica, etc. It is possible to have 0 TDS and still have po4, however if your ro/di is working correctly it should remove it, unless your tap water is super high in po4. I know that a lot of people on well water have super high po4 at the tap and have to use specific cartridges to remove it or run it through gfo prior to using it.
TDS is total dissolved solids, like iron copper, silica, etc. It is possible to have 0 TDS and still have po4, however if your ro/di is working correctly it should remove it, unless your tap water is super high in po4. I know that a lot of people on well water have super high po4 at the tap and have to use specific cartridges to remove it or run it through gfo prior to using it.
Did you test both po4 and TDS of the tap? Did you test both TDS and po4 after the membrane? Did you test both po4 and TDS after the DI?
The ratios of po4/TDS should all be close to similar, if not, that will tell you where your problem is.
(po4 tap)/(TDS tap) = (po4 after membrane)/(TDS after membrane) = (po4 after DI)/(TDS after DI)
The ratios of po4/TDS should all be close to similar, if not, that will tell you where your problem is.
(po4 tap)/(TDS tap) = (po4 after membrane)/(TDS after membrane) = (po4 after DI)/(TDS after DI)
Hey Johnny,
*
Phosphates and silicates are extremely difficult to remove from fresh water.**Unfortunately TDS meters are not accurate enough to ensure there are no phosphates*in the fresh water.**I use the*Hanna PO4 meter to measure our fresh water all the time and it is helpful even if it's not accurate.* I seem to get higher readings with the Hanna meter than I do with saltwater.* As an example, we usually measure 0.04 ppm on our*RODI water but after we mix the water with salt we get 0.00-0.01 ppm with the same water!* Also, the RODI sometimes gives us crazy results.
*
Anyways,*if your TDS is reading 0 after your DI I don't think the phosphates are going to be an issue.* I would recommend using at least 2 DI cartridges after you RO to*make sure the water is as pure as possible.* I like the Spectrapure Maxcap and Silica Buster cartridges but really any will work.**Also, if you use 2 DIs only replace*one at a time.* You should replace the one closest to the RO, then move the*second one over and put the new one last.* That way the last DI is always the freshest one.
*
Thanks,
Aaron
*
Phosphates and silicates are extremely difficult to remove from fresh water.**Unfortunately TDS meters are not accurate enough to ensure there are no phosphates*in the fresh water.**I use the*Hanna PO4 meter to measure our fresh water all the time and it is helpful even if it's not accurate.* I seem to get higher readings with the Hanna meter than I do with saltwater.* As an example, we usually measure 0.04 ppm on our*RODI water but after we mix the water with salt we get 0.00-0.01 ppm with the same water!* Also, the RODI sometimes gives us crazy results.
*
Anyways,*if your TDS is reading 0 after your DI I don't think the phosphates are going to be an issue.* I would recommend using at least 2 DI cartridges after you RO to*make sure the water is as pure as possible.* I like the Spectrapure Maxcap and Silica Buster cartridges but really any will work.**Also, if you use 2 DIs only replace*one at a time.* You should replace the one closest to the RO, then move the*second one over and put the new one last.* That way the last DI is always the freshest one.
*
Thanks,
Aaron
