"unclenorm" wrote in message
ups.com...
Hi George,
Your problems are in no way related to the use of RO or DI or
RO/DI water for evaporation top of, a PH of between 4 and 5 is quite
normal for an efficient RO/DI unit, commercially produced RO/DI water
has a buffer added to it as the law in most countrys requires drinking
water to be not less than neutral i.e. PH 7.0. My 300g system has an
evaporation rate of 20 litres per day which is replaced daily with
RO/DI water at PH 5, taken before the buffer is added (we have a
commercial RO/DI water plant in the family), my PH is constant at 8.3
or 8.4 in all my tanks, I do occasionally add 'Kalk' to my top of water
as as when it is necessary. Your problem is in your tank water, as has
already been stated and you should know evaporation does not remove
buffers or anything else. (leaks will though !!). For someone claiming
to have done a 2 year chemistry course and hold a masters degree in
Hydro geology and was it 30 odd years in the hobby? you are not talking
much sense, a lot of your statements are 'iffy' to put it mildly.
regards,
unclenorm.


Plants and animals will cause changes in the tanks buffer system, particularly
plants. The buffers don't stay in solution indefinitely, whether there is
evaporation or not. Some of it gets used up. And yes I've been in the aquarium
hobby all of my life, though have only had a salt water tank for 14 years.