Pool is perfect, except morning algae

cschnurr

Silver Supporter
LifeTime Supporter
Sep 21, 2007
121
Guelph, Ontario, Canada
Pool Size
96000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Until recently I am running my SWG at 30% for 10 hours per day that provided for FC around 3ppm. The water was quite good.

In early August, I noticed a bit of slime on the bottom of the pool, so I changed to run the pump 24/7, which increased my FC to around 6 ppm. My pool water looks perfect, crystal clear and bright throughout the entire day and evening. However in the morning the water looks clear, but there is a considerable amount of what looks like algae sitting on the liner in the deep end. Every morning, I have been vacuuming it up with my robotic vacuum and I clean out the vacuum's filters every time. I never vacuum to the pool pump/filter. The water remains perfect for the rest of the day.
In general this is an inconvenience, but I'm concerned that the algae may bloom if not cleaned up immediately. If I plan to go away, I don't want to need to have someone vacuum the pool often.

My numbers are
CYA 70
CH 300
pH 7.8
TA 110
FC 6,
CC 0
Salt 3300
SWG 30%
Pump 24/7

I have noticed similar occurrences during August and September in other years.
I live in Southern Ontario. We currently have daytime highs in the low 90's (degrees F), and night time lows mid 60's. Our water temp is just under 80F.
Every morning there is some mist evaporating from the pool. Could my morning algae be related to the heat loss of evaporation each morning?

Does anyone else have this problem?
 
Last edited:
Hi awj22,
I've decided that given I'll be closing in a couple weeks, I'm travelling a bit, so I doubt I'll be swimming much, I need some more FAS-DPD to do the test, and the inconvenience is minor; I 'm just going to let it be.
But I know I'll have the problem again next year, and I'll do the test as you recommended.
 
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