PH vs TDS

[mark49]

Hi everyone,just trying to get my water parameters correct.I mix RO and tap water together to achieve around 80 to 100 TDS but my PH is always around 7.4 to 7.5.Should I reduce my mixing ratio which would in turn decrease my TDS thus lowering my PH to around 7 which I am aiming for.

Mark.

 

[dw1305]

Hi everyone,just trying to get my water parameters correct.I mix RO and tap water together to achieve around 80 to 100 TDS but my PH is always around 7.4 to 7.5.Should I reduce my mixing ratio which would in turn decrease my TDS thus lowering my PH to around 7 which I am aiming for.

80 - 100 ppm TDS should be fine for nearly all L. numbers. You don't need to worry too much about pH as you get nearer to 100% RO. The pH you get is going to be dependent upon your tap water. If it is hard, even a couple of drops of it in pure RO will raise the pH.

Have a look at this thread <http://www.plecoplanet.com/forum/showthread.php?t=8904> & <http://www.plecoplanet.com/forum/showthread.php?t=9323>.

cheers Darrel

 

[Irene0100]

that tds is fine, do not want it lower or can become unstable quickly. i would suggest lowering ph with more bog wood or indian almond leaves or some blackwater extract.