hot water does have high levels of tds. Mainly because its heated in a large metal drum called a water heater. The lining deteriorates over time, and causes higher tds elvels.Secondly the efficiency of a RO membrane actually increases when using hot water. RO membranes can easily handle water up to around 180 degrees F. In cold climates it is quite common to use a mix of hot and cold water for supply a RO filter. It will not shorten their life span. As for hot water containing more TDS that is absurd. Heating water does not increase the TDS but usually decreseses the TDS. It will often increase y the amount of particulates though. Particulates are removed by the prefilters not the RO membrane. The reason that you are suppose to occasionally drain sediment (particulates) from the bottom of a haot water tank is because heating the water removes calcium from the water by making the dissolved calcium into calcium particulates (calcium carbonate).
In short don't rely on pH readings of RO water.
yeh, that sounds like bs. ro/di water will have 0 ppm and a neutral ph level. 7.0 point on.I called my hydro shop and the girl there told me that The PH shouldnt be changing at all, if the tap comes out at 7.5, then so will the RO'd water...at 7.5
She said the only thing that the system does, is lower PPM, which is coming out 15 PPM.
Then again this is the same girl that gave me horrible advice once, trying to make a sale.
Does RO water normally make PH fluctuate?
what pre-filters (kind and ppm rating)are you running on the ro and how old are they?my ro system is 0 ppm but the ph is 4.3
that is a bit off. a 1:10 ratio is a bit high. some older membranes run at those, but most new models operate somewhere in the 1:3 to 1:5 range.u think thats messed up if i make 5gals. of ro water it wiil make 55gals. of waste water