bkirik :

Welcome to the PB forum. Below is the best link I have found on the interactions of ph , alka. , lime etc on water quality. With less growth/activity in the pond during winter you will get less of a daily swing in ph. Alka. does not change quickly like daily ph swings. In our ponds alka. is effected more in winter as a result of large rain events which are more acid than the pond water ( pond flushing).


http://srac.tamu.edu/tmppdfs/7107322-464fs.pdf