I have 26 round, above ground, 15000 gallons, 150sq ft cart filter. About 1.5 weeks ago i had some green algae spots. Never green-green water just spots. still gross. i went and got test kit wal-mart vacuumed and brushed pool. After 2 bags hth shock, 4 gallons of bleach and 1.5 box borax(ph was...