Flocculation, Reflocculation and Overflocculation

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
richardpooldone
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Flocculation, Reflocculation and Overflocculation

Postby richardpooldone » Fri 07 Apr, 2017 19:33

So I recently had my first green algae bloom after my two large live oaks dropped their pollen this spring. So I added a dose of Diclor, filtrated for two hours to mix then added a flocculant and mixed for two hours. The next morning the dichlor and floc had done a fantastic job. The algae was dead as a door nail and flocced and dropped to the bottom of the pool.

Now came the hard part, getting the dead algae out of the pool.

I vacuumed most of it out but in the process (about a week long) I ended up stirring up the flocculated dead algae. So while the pool looks much better it still has a cloudy hew to it. I've let it sit and the flocced algae still creeps to the bottom and I'll vacuum again when it seems appropriate.

My questions for the forum are this:

1. Should I/could I add more flocculant now that it's been a week to makes sure all the suspend dead algae is clumped and dropped to the bottom of the floor? Or just be patient with the dosage I've already used?
2. Overflucculation. Is there such a thing and what could/would the dangers be?

This is my first post so thanks for your replies in advance!

Happy Swimming!

Richard!


Denniswiseman
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Re: Flocculation, Reflocculation and Overflocculation

Postby Denniswiseman » Sat 08 Apr, 2017 02:38

Hi Richard
Flocculant is not generally considered good and when used should be vacuumed to waste, also Dichlor adds CYA to the water making your chlorine ineffective. Liquid chlorine (bleach) is best
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
To defeat algae you need to Slam
These other links will help you keep your pool in pristine condition
Chlorine / CYA Chart
Pool Levels
Pool Maths
You really need to get a decent test kit (TF100 or Taylor K2006C) to get accurate pool levels as pool stores and strips are widely inacurate
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Re: Flocculation, Reflocculation and Overflocculation

Postby raidermike » Wed 29 Apr, 2020 15:42

I have a blue cloudy pool after killing all the algae. I have been vaccuming and running pump. Backwashing once a day. But after this morning shock still cloudy. Will floc solve my problem? I have 6600 gal. Above ground pool. Will 5oz. Of floc will be enough? Should i just continue to shock and vaccum? When should i add my cyanuric acid? My Ph looks good arou d 7.2-7.4, F/C is around 5ppm. What next?

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Denniswiseman
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Re: Flocculation, Reflocculation and Overflocculation

Postby Denniswiseman » Thu 30 Apr, 2020 03:27

Read my post above it still applies
You say "When should I add my cyanuric acid?" How have you been chlorinating
Let's have your numbers
FC:
TC:
pH:
TA:
CH:
CYA:
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Re: RE: Re: Flocculation, Reflocculation and Overflocculation

Postby raidermike » Thu 30 Apr, 2020 06:43

Denniswiseman wrote:Read my post above it still applies
You say "When should I add my cyanuric acid?" How have you been chlorinating
Let's have your numbers
FC:
TC:
pH:
TA:
CH:
CYA:
I'll run a complete test in the afternoon and get back with those numbers. I added 1 cup of muratic acid an hour ago to bring ph down some more.

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Denniswiseman
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Re: Flocculation, Reflocculation and Overflocculation

Postby Denniswiseman » Thu 30 Apr, 2020 11:41

Why did you bring down, your pH 7.2 to 7.4 is pretty good, did you mean to bring your TA down?
If so you will need to aerate to bring your pH up again
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Re: RE: Re: Flocculation, Reflocculation and Overflocculation

Postby raidermike » Thu 30 Apr, 2020 15:15

Denniswiseman wrote:Why did you bring down, your pH 7.2 to 7.4 is pretty good, did you mean to bring your TA down?
If so you will need to aerate to bring your pH up again
FC- .00
PH- 7.5
TA-100
TCH-150
CYA- 0
I just shocked again. No chlorine. Still cloudy but can see the botton through the clouds.

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Re: Flocculation, Reflocculation and Overflocculation

Postby raidermike » Thu 30 Apr, 2020 15:17

I have the above ground vinyl pool so tch is actually pretty good.

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Denniswiseman
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Location: United Kingdom

Re: Flocculation, Reflocculation and Overflocculation

Postby Denniswiseman » Thu 30 Apr, 2020 16:45

Yes most of those figures are OK except for FC and CYA
Get some CYA up to the 40-50 level and your FC up to 7 and test
Shock is just a high level of chlorine and with the rightlevel you don't need to shock

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