I would suggest testing your cya level. It may be that you have none in there. I find that to be true of my pool each spring. I close with a cya reading, and open to none. Other people are able to maintain a cya reading throughout the winter. Some people have suggested that pools that turn into a swamp over the winter cause the cya to drop, but I open to a clear pool each year, so that isn't the case. Who knows where it goes! Another thing that could be happening in your pool is that you may have something organic in there that you can't see that is consuming your chlorine. I think your plan of just trying to keep enough chlorine in there to prevent algae growth until opening is reasonable, although if you find that you are having to add bleach very often, I'd go ahead and take it up a little higher than you presently are just so you don't have to add it so often. Can't comment on how high to suggest without knowing your cya reading. On second thought, with a gunite pool, you don't really have to worry about going too high with your cl as you do in a pool with a vinyl liner.
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