I have a camellia with yellow leaves and would like to save it...

The camellia has been suffering for over a year but I can't seem to help it. I have tried foliage feeding, more water, less water... it is an established shrub (more than eight meters tall and nearly two meters across. It is less than a meter from our in ground, salt pool and has been there for years. Do you think location might have something to do with it? Should I try to relocate It?
q i have a camellia with yellow leaves and would like to save it
q i have a camellia with yellow leaves and would like to save it
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