I’ve been battling mustard algae since the summer. Looks like sand and comes back after being brushed, to all the exact same places in the pool. Currently trying to slam the pool using test strips, day 5 and seems like little progress is being made. My question is should I stop and wait for new test kit to arrive? I can shock the pool and add sodium bromide and all the algae turns white, vacuum it out, but it still comes back. Any help is appreciate.