high chlorine and algae...

Chlorinating, maintaining the right chlorine levels,
chlorine problems. Dichlor, trichlor, cal hypo, bleach,
granules, chlorine pucks and chlorine sticks.
Pool Newbie
Pool Newbie
Posts: 1
Joined: Thu 28 Jul, 2016 13:39
My Pool: 12 by 30 inground, vinyl liner, sand filter

high chlorine and algae...

Postby sailor61 » Thu 28 Jul, 2016 13:56

I've got an ongoing algae battle and I think I'm just not slamming the pool hard enough..

The basics..
12 by 30 inground with a vinyl liner and sand filter. I use the slow dissolve tabs. Figure it holds around 14,000 gallons.

The PH has been around 7.2, alkilinity was 80.

CYA was 50. I've never known my Cl to be below 4 or 5.

I had an algae bloom start and added 2 pds of powdered Cl. Algae seemed to go away, cleaned the pool, had water tested and was told it was all perfect. Algae returned...2 more pds of Cl shock..algae gone but CL was off the charts. Water was clear - main drain was perfectly visible - but water had dingy look to it. I figured I was dealign with a combined cl issue so this time I hit it with a pound and a half of monopersulfate. Overnight the water took on a sparkle. CL remained very high - like off the charts on my test kit - but water felt ok.

Less than 24 hours later I'm back to the algae precipitating out onto the bottom of the pool...and my CL is still off the charts.. Did I not shock the thing hard enough? It seems to me that I'm dealing with a combined chlorine problem and the organics from the algae are binding up whatever I put in the pool. How much shock - and what type - should I be adding to try and get this thing back to right?

The water has not been green - what I get is a flat look to the water and greenish "dust" on the bottom.

I don;t have current PH and alk numbers - local pool store says they can't retest until CL is down lower...and they only test for total chlorine not just free.

Thoughts? Suggestions? Thanks in advance.

Swimming Pool Superstar
Swimming Pool Superstar
Posts: 859
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: high chlorine and algae...

Postby Denniswiseman » Thu 28 Jul, 2016 15:08

Get a Taylor K-2006C test kit, you will be able to test for combined chlorine
Follow the slam procedure exactly http://www.troublefreepool.com/content/125-slam-shock-level-and-maintain-shockingl
Don't take any short cuts
Let your chlorine go down to get a correct PH
You can work out your shock level for your CYA http://www.troublefreepool.com/content/128-chlorine-cya-chart-slam-shock
Use Bleach or liquid chlorine to raise your Chlorine the tabs and stabilised chlorine have CYA in them and will throw things out

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