I have a three week old pool.Last week my chlorine levels went to zero because of not enough pucks in chlorinator. A week later and plenty of pucks I can't get my numbers beyond zero.i do know I have chlorine as I can smell it. My PB said to crush pucks and put in skimmer it didnt work. PB says because of pebble tech can't shock for 3 weeks. Any ideas all other levels are good.