tonyb
07-09-2013, 11:31 AM
2nd year pool owner...
Having problems with recurring algae this year. Water fairly clear, but green algae continues to build up on floor and walls every 4-5 days.
Latest example...
Friday - green powdery alage on pool floor and walls. Not really visable unless brushing. shocked pool to 15ppm, kept there thru Saturday.
Sunday am vacuumed dead algae (white/grayish). No powdery green algae.
Monday - water getting clearer, but green powdery algae back on floor/walls. Free chlorine down to 8.5. Vacuumed again to remove algae.
Tuesday am - water very clear, but green powdery algae back on floor/walls. Free chlorine down to 6.0.
Levels maintained very consistently
PH = 7.4
Free Chl = 3-7
Alk = 110
CYA = 70
Have been using 3-4 PPM of Chlorine per day, which seems very high. Pool in 100% sunlight. backwashing regularly to clear after each cleaning.
Do I simply need to keep shock levels for a longer duration than two days?
20,000 gallon
Vinyl liner
Sand filter
Having problems with recurring algae this year. Water fairly clear, but green algae continues to build up on floor and walls every 4-5 days.
Latest example...
Friday - green powdery alage on pool floor and walls. Not really visable unless brushing. shocked pool to 15ppm, kept there thru Saturday.
Sunday am vacuumed dead algae (white/grayish). No powdery green algae.
Monday - water getting clearer, but green powdery algae back on floor/walls. Free chlorine down to 8.5. Vacuumed again to remove algae.
Tuesday am - water very clear, but green powdery algae back on floor/walls. Free chlorine down to 6.0.
Levels maintained very consistently
PH = 7.4
Free Chl = 3-7
Alk = 110
CYA = 70
Have been using 3-4 PPM of Chlorine per day, which seems very high. Pool in 100% sunlight. backwashing regularly to clear after each cleaning.
Do I simply need to keep shock levels for a longer duration than two days?
20,000 gallon
Vinyl liner
Sand filter