Pool Shock & Floc Not Working

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Chlorine= 0ppm



Hardness =190ppm

Cyanuric Acid=30ppm

Sand filter

I have a 30' x 52" above ground pool.

The water was green at start of this year. I brushed walls and floor and added 12 pounds of shock & 1qt. of algaecide and let pump run for 12hrs. Then added 2qt. floc and let pump run (in recirculate) for 4hrs, turned off and let set.

Waited up to 72hrs and water looked cloudy with hint of a green tint. Then found live algae on floor so I brushed real good and added another 10-12lbs. of shock and let run for 12 hrs then added floc again.

It has now been 24hrs and this is where I am at. Water looks really cloudy whitish-blue color. Every thing I've done was per a local pool place (Crystal Pools, Jenks, ok) Any advice? Thank you


Thanks for the question Jerry

Your 30 X 52 above ground pool would hold approx. 21,200 gallons of water, so we'll start from there.

First is the algaecide. An algaecide is used for preventative maintenance only, it's never used to clear up an existing algae bloom or green pool water. When you keep your chlorine level between 2 - 4ppm there's really no reason to use an algaecide.

If you do decide to get one, be sure it's a PolyQuat 60. This contains no metals and is safe for vinyl pools. It can be used as temporary insurance while you're doing a shock, but this is about it.

Next is the floc. On this website, and most pool forums, will tell you that floccing a pool, while it may have it's benefits, will more than likely not help. My general rule for pool care is to not use a product that isn't necessary. If you use products that aren't required, you're wasting more time and money, and run the risk of negative side effects.

While floc may not have big side effects, it does cost time and money. Floc can't take care
of live algae. All of the algae needs to be dead before you try to use floc. Your must kill all of the algae first, then use a floc. Your pool is probably cloudy for a few reasons:

*Your algae is dying or is already dead

*You used a floc

*Your filter is not working at 100%

And due to the nature of sand filters, it will take longer to clear a pool that has used a floc. Your CYA is good. For maintenance, it should be between 30 - 50ppm. Try to shock in the evening and retest your chlorine level in the morning. If you still have a good shock, this means the CYA is working and the chlorine has consumed all the algae. A good shock is maintaining the FC at 12ppm until the algae is dead. This means manually dosing your pool with liquid chlorine. Use 1 gallon per 10k gallons of pool water. Shock is a process, not something you buy. It's maintaining a FC of 12ppm to kill the algae.

Sometimes it will seem to take massive dosing of chlorine to get rid of the pool algae. Your pool will be cloudy for a while as the filter clears everything out.

Here are the links to raise your alkalinity and pH levels:

Swimming Pool Chemistry

Pool Alkalinity

Total Alkalinity

Swimming Pool pH Levels

Pool pH

Be sure you're backwashing once per day. I have cleared hundreds of green pools and have never used a pool floc. You're doing right in chlorinating your pool, brushing, filtering, testing, work, and patience. This is really the only true method to getting your pool back into shape. It may take a few days to a week to get your pool crystal clear once again. The answer is not in a magic bottle. The best thing to do is to not get suckered into buying all kinds of products that you don't need.

Hope this helps and let me know how it turns out for you.


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After Using Flock In My Pool

by April

After using flock in my pool in was clear I could see the bottom and there was alot of stuff on the bottom to vacuum. I vacuumed it, but forgot to set the pump to waste and it was recirculating while I was vacuuming. Now I can not see the bottom and there are white flakes floating on top. What can I do to fix this. Thanks.......

Hi April. Using a floc only covers up issues so we need to get to the real issue of why a floc was used. If the pool was cloudy or green it could be the chemicals are off and/or something is wrong with the filtration system.

To answer your question, there are a few ways you can go. First is to allow everything to settle once more, then vacuum to waste. Next is to keep filtering 24/7 and backwash once per day. And the last resort is to do a 1/2 - 3/4 drain and refill. You need to get the floc out of the pool and those are the only ways to do it.

Unfortunately there's no "quick fix" to an issue such as yours.


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