Best Liquid Chlorine to buy from Home Depot? How much needed to slam 19,800 gallon above ground vinyl pool?

AmyBarton

Member
Jun 3, 2017
17
OK
Can someone tell me the best liquid Chlorine to buy from Home Depot that has the most chlorine? How much needed to slam 19,800 gallon above ground vinyl pool?
 

IceShadow

Gold Supporter
Jun 8, 2019
1,028
Milwaukee, WI
Home Depot sells a 10% sodium hypochlorate solution which is the highest concentration they sell (and typically the best price per available chlorine). Not every HD sells them, so you'll have to see if the one near you does.

It's hard to say how much will be needed with a SLAM as it depends on how long it goes, how much the pool needs to use to defeat organics, what the CYA level is, how much is used up to sun, etc.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,191
Tucson, AZ
The strength is listed on the bottle. It is usually 10%. Use PoolMath to determine how much you will need to add to reach your FC Target that is a function of your CYA level according to the FC/CYA Chart
 

rowiac

Well-known member
Apr 20, 2018
70
Tehama County, CA
This is what my local Home Depot carries for 10% bleach (aka Chlorinating Liquid):


If your HD has it, it is most likely in the gardening section, possibly outside. Look for the latest date code on the box to get the freshest ones. While I was SLAMing recently I bought 6 or 8 boxes at a time, for a total of about 32 gallons over a 5 day SLAM on my 26k gallon pool. The amount you will use depends on the volume of your pool and the condition of the water.

And TFP recommends against using any algaecides or clarifiers under normal circumstances. Just stick with straight bleach.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,191
Tucson, AZ
Do you suggest any brand algicide and or clarifier from home depot?
We do not recommend the use of algaecides (except for very specific ones in very specific circumstances) or clarifiers.
Why do you think you need them?

The tenet of TFP is to only add what your pool needs based on accurate test results.
 

AmyBarton

Member
Jun 3, 2017
17
OK
I have green water but don't see algae growing and when I backwash it is clear and also clear when rinsing. However, My gauge ends at 36 and when the pump is turned on it is at 33 (used to be down by the 20's). This year I changed out the sand to this new sand with the pool store telling me I didn't need as much with the new sand (it was pricey) but they said it would filter better with less sand. I did have a couple of inlets breaks when cleaning and I replaced them. During backwash the gauge turns down to 25. I then rinse and when I turn back on pump to filter gauge goes back to 33 even though I backwashed and rinsed. I also get a little bit of sand back in the pool. Help! Thank you!
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
21,165
Laughlin, NV
This year I changed out the sand to this new sand with the pool store telling me I didn't need as much with the new sand (it was pricey) but they said it would filter better with less sand.
If the increased pressure coincided with the act of changing to (what is it?), then that is your cause.

The best filter media for a sand filter, is, sand. Plain, #20 silica sand.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,191
Tucson, AZ
I think the store swindled you. Sand always works and we often see reports that alternative media has problems.
Hopefully they did not sell it to you under the guise that it would clear up your green pool. It won't. You need chlorine to kill it first by following the SLAM Process
 

AmyBarton

Member
Jun 3, 2017
17
OK
I have the Leslie test kit.
FC 0 (although I put in a gallon 10% bleach last night)
PH 7.5
CYA 65
TA 110
Can you slam starting in the day? How much chlorine 10% do I need to reach 28 FC since my CYA is 65?
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,191
Tucson, AZ
I have the Leslie test kit.
FC 0 (although I put in a gallon 10% bleach last night)
PH 7.5
CYA 65
TA 110
Can you slam starting in the day? How much chlorine 10% do I need to reach 28 FC since my CYA is 65?
Which Leslie's test kit?
Does it include the FAS-DPD chlorine test?
You may have the equivalent of the K-2005 and just need to add the FAS-DPD chlorine test to have the equivalent of the K-2006.
You can use PoolMath to calculate how much bleach is required to reach your desired target.
 

AmyBarton

Member
Jun 3, 2017
17
OK
Leslie total poolcare DPD test Kit 18-576. Tests for Free & Total Chlorine or Bromine, pH, acide & base demand, total Alkalinity, Calcium Hardness, Cyanuric Acid