Recording First Slam And Get Rid of Algae!!!

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G

Guoji

Member
Jun 10, 2024
22
Yorba Linda CA
Pool Size
30000
Surface
Plaster
Chlorine
Liquid Chlorine
My family move into this house last year April. Although it is not on our wishlist, but there is an inground pool in backyard. In last summer, we use tons of pucks to keep water in blue. To be honest, I still thought it is made by cal-hypo until I found this forum two weeks ago. Yes may be you guessed I'm not a English native speaker so that I can not recognize the words on the ingredients list. Just stupidly brought it from Costco's shelf to home because puck is the product which contain highest chlorine I can found in wholesale. Things are getting worse day by days. We ended up with a green pool and give it up.
Luckly I found TPF when I searched what is Trichloro-s-triazinetrione. I was shock and realized I mess up the water in my pool. After I read the SLAM in TPF, I realized I had found a treasure! I believe this will definitely solve the problem. Acutally I am not completely ignorant about water chemistry because I majored in Aquaculture in university and learned water chemistry to maintain fishpond water. But it's still first time to manage pool water for me. I still make a lot of stupid mistakes during my first SLAM and haven't finish it yet (started at June 15).
 

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The key parts of theSLAM Process are
Maintain the FC level based on your CYA by testing 2-4 times a day.
Use liquid chlorine to top up your FC to the SLAM level needed.
Circulate water 24/7 and monitor your filter pressure. Clean or backwash when pressure rises 25% over the baseline starting pressure
Remove heavy debris via vacuum or via scooping it out.

Let us know how we can help you. Tell us what type of equipment you have for filter and pump.
 
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Before adding chlorine. I added 2 gallons of 14.5% muriatic acid from Home Depot. There was no stir of events. According to test strips, just the color shifted from darker than pH 9.0 to slightly lighter, but still above 8.4. I added another gallon 31.45% from ACE hardware. It decrease to around 8.0. I can barely distinguish the color between 7.8 and 8.0. I was confused. According to pool math, I totally overdosed on acid in the pool. I almost lost my patience and directly poured the remaining bucket of muriatic acid into the pool.
 
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I open my D.E filter and clean grids every night. Back wash doesn't seem to be very effective。 Pressure raises up in very short time after back washing but a thorough open cleaning can make the filter last for a day or two.
 
You're now in the mechanical battle needing to filter it all out. Keep the FC up as good measure, brushing may expose new algae that was protected by a biofolm, but for the most part the water should be sterilized now.

Fast filter cycles mean you're making great progress. When it's taking longer, it means you aren't trapping much.
 
Guoji said:
I open my D.E filter and clean grids every night. Back wash doesn't seem to be very effective。 Pressure raises up in very short time after back washing but a thorough open cleaning can make the filter last for a day or two.
Click to expand...
That is a positive step in that most algae is dead and now is the chore to remove it. I would continue to clean the DE filter every 2-3 days as a clean filter will help clear the water. However, I would continue to keep FC at SLAM level just to ensure there is nothing lingering.

With a DE filter, you may have the option to circulate to waste which avoids putting it all into the filter but then you have to add replacement water.
 
HermanTX said:
That is a positive step in that most algae is dead and now is the chore to remove it. I would continue to clean the DE filter every 2-3 days as a clean filter will help clear the water. However, I would continue to keep FC at SLAM level just to ensure there is nothing lingering.

With a DE filter, you may have the option to circulate to waste which avoids putting it all into the filter but then you have to add replacement water.
Click to expand...
Unfortunalty there is no waste in my filter:cry:. I have a slide valve. I consider remove grid in the filter then use back wash position to vacuum to waste.
 
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update: June 21, Because of intense sunshine in California this afternoon. My FC decreased to 8ppm. I test my TA CH and pH to get more accurate results. Here is the results: pH 7.6~7.8 TA:150ppm CH:360ppm. Should I need to add some acid?
 
I made a silly mistake when I wash D.E grid first time. I wash it on lawn and yard ground. Powder is very where now. But I switch to using cellulose fiber from D.E powder, try to reduce health damage.
 
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Guoji said:
update: June 21, Because of intense sunshine in California this afternoon. My FC decreased to 8ppm. I test my TA CH and pH to get more accurate results. Here is the results: pH 7.6~7.8 TA:150ppm CH:360ppm. Should I need to add some acid?
Click to expand...
Lower pH to 7.2 then raise FC to SLAM level. It is important to “maintain” FC level to make the process go quicker.
 
I woke up this morning to a pleasant surprise: I could see the bottom of the pool at its deepest part, which is 12 feet deep. I even managed to fish out the new skimmer basket that my mom accidentally dropped three weeks ago. Just now, I brushed the pool walls at 7 pm. Yet now the pool is murky and cloudy once more, which is really frustrating.
 
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