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Swim spa high chlorine demand

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I have a 6000L swim spa that for some reason will not get a suitable free chlorine level.  I stabilized all other chemicals after a short period of it not being used but I can not yet get the FCL to a suitable level. I add 60g of sanitizer (530g/kg chlorine and 150g/kg bromide) often, upon adding it it turns yellow immediately and does not change the free chlorine level. I've added many doses over the course of the week and shocked it a few times, trying to get it stable for the past week but nothing seems to be working. Do I just need to keep adding it more frequently? Should I try out a chlorine shock? 







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