Algae?

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Fugazi

Well-known member
Apr 9, 2015
80
Saint Augustine Fl
I have a black Marcite pool
So it’s hard to tell if it’s algae
I also have a calcium hardiness issue
I live on an island and underneath is shells for foundation
I had 600ppm CH and I drained 3/4 of the pool it’s a 15k gallon pool
It went to 375 this was in middle of Jan.

Now I retested it and it’s 500 :(

The stats are
tc 3
Fc 3
Cc 0
Ph 7.4
Ta 100
Ch 500
Cya 30

Here are the steps

Any ideas on if it’s algae and Ifso what type? Is there a way to tell?
 

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Fugazi said:
Any ideas on if it’s algae
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The darker areas on the steps? You can rub a chlorine tablet on the area (don't let it sit) to see if it lifts the stain - organic test. Have you been experiencing a large FC drop each day? Have you performed an Overnight Chlorine Loss Test?

As for the CH increasing, how are you chlorinating each day? Have you been using cal-hypo powdered products? Are you implying your local water is extremely hard due to the shell content in the soil/local aquifers? Have you ever tested your tap water to confirm its CH level?
 
I’ll do a chlorine drop test tonight
I haven’t used pucks since December but I started to use it to raise the cya since it was near 0 after the refill.
The city water ch is 125, im not sure what the aquifer ch is but I live on an island that was a marsh in the 1920’s and the marsh is made of clam shells. They dredged the bay to fill in the part where I live and it was made of clam shells. My neighbors have white pools so they prob don’t notice.
It’s just a guess as I don’t know of any other reason why it would continuously rise. I mainly use liquid chlorine and only pucks minimally.

Ill go rub the luck on the spot in the stairs to see what happens
 
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Rubbing the puck didn’t do anything on the puck and just left a chalk on the steps which I just brushed off and it didn’t look any different
I did walk around it and saw the rubber guard on the pool step have green algae so I’m going to assume it’s green algae at least on the rubber step guard and I’m going to slam it and scrub s few times during the process
 
So anytime you wonder if something is brewing, Overnight Chlorine Loss Test. Don't come ask us if you should, just do. Then come tell us *why* you're OCLT-ing and we'll sit around and help pass the time while waiting for the results.

If you read the instructions, you're supposed to raise the FC to 8 - 10 for the OCLT. At that point for the average liquid chlorine user, SLAM FC is only 12 (CYA 30), so you might as well fire first and OCLT later.

If you pass the following morning, great. If you fail you're 12-16 hours into the fight already. :)

One thing I've learned around here from seeing it go down many times is that newbs sit around and ponder while coming up with excuses why they don't need to OCLT. The pros SLAM it on the spot and then chuckle in the morning when it turns out they didn't need to. Or they pat themselves on the back because they did.
 
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