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Green swimming pool? - pool h2o products codes

What is the difference in yellow and green algae, I have yellow - Why? We fought against this, since I returned from vacation 1 month ago - we have a tower, 27 'of the earth. All readings are good that the seller of the pool. We have moved - algecide all be used. If the pool water Vac is very dark, greenish-yellow, from the ground. Let us with algaecides, ACC, shock, and again, and the pool is still green. You can not drain - is not an option because we have to maneuver to continue H2o and expensive. Other ideas? Help