SLAm

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parisdpm

Bronze Supporter
May 26, 2013
59
Union City, TN
Pool Size
35000
SWG Type
Hayward Aqua Rite (T-15)
Im on day 4 of slam. Still have a good bit of algae. Ive made some assumptions, hopefully correct during this.
1. After initial test of CYA, its not done again and adjusted correct?
2. The recommendation here was shut off SWG, so I did that and used the chlorine/cya chart for target(12), is this correct?
3. I am testing/adjusting about 5 times a day with the recommended test kit. Still seeing a good bit of algae, on bottom/ sides, etc. It brushes away, but returns in 30-45 mins along seams first. I haven't done
chlorine loss test over night yet, because still seeing a good bit of algae, is this correct?
Thanks for any input.
 
No need to test CYA unless a significant water exchange is done.
Leaving the SWCG off is correct.
Keep testing and adding chlorine as often as life allows. Brush, brush, brush.
No need for the OCLT until the water is crystal clear.
 
You are correct on items 2 and 3. I'm not sure I understand item 1 though. Maybe this will help you ...
Adding CYA:
To increase CYA via granular stabilizer, place the required amount as calculated by the Poolmath calculator into a white sock and place in the poolside skimmer basket. For those concerned about suction flow to the pump, suspending the sock near a return jet or from a floating device will also suffice. Best never to allow undissolved granules to rest directly against the pool surface. Squeeze the sock periodically to help it dissipate. Once dissolved, consider your CYA adjusted to that programmed (target) level. CYA test readings should show a rise in 24-48 hours, however some pools may experience a longer delay to fully register. Best to confirm final CYA in about 5-7 days before adding any more stabilizer/conditioner.

CYA Testing:
Proper lighting is critical for the CYA test, so you want to test for CYA outside on a bright sunny day. Taylor recommends standing outside with your back to the sun and the view tube in the shade of your body. Use the mixing bottle to combine/gently mix the required amounts of pool water and R-0013 reagent, let sit for 30 seconds, then gently mix again. Then, while holding the skinny tube with the black dot at waist level, begin squirting the mixed solution into the skinny tube. Watch the black dot until it completely disappears. If it helps, pour a little, look away, then look back and pour some more. Once it disappears, record the CYA reading. After the first test, you can pour the mixed solution from the skinny view tube back to the mixing bottle, shake, and do the same test a second, third, or fourth time to instill consistency in your technique, become more comfortable with the testing, and validate the CYA reading. If you are still questioning your own results, have a friend or two do the same test 2-3 times. Share your results only after everyone is done to see if you came up with the same average results.
Click to expand...
 
mknauss said:
No need to test CYA unless a significant water exchange is done.
Leaving the SWCG off is correct.
Keep testing and adding chlorine as often as life allows. Brush, brush, brush.
No need for the OCLT until the water is crystal clear.
Click to expand...
Thanks for the info. On average, is this typically a 3-5 day thing, or 2 week type operation?
 
From your description, and depending on what type of filter you have, I suspect a week to at least 2 weeks.
 
Sand filter will take the longest.

You can do the DE add once the pool is blue and cloudy.
 

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After 6 days I am finally making progress! Over night I had minimal chlorine loss(called for 1.5 qts), yet today, sunny and 95, I've used 4.5 gallons of 6% bleach. I can see a dime on the bottom. I have found my best remedy for the algae is vacuuming, which has necessitated probably a 15% water change. Now my question: after this water exchange, chemical wise, is the only thing I need to be concerned about checking until SLAM done is CYA?
 
Whenever you do an excessive amount of vacuuming to waste (exchanging water), then you'll want to re-test the FC & CYA. Not everyday, but certainly if you do a lot of vacuuming to waste. Now if you are only doing a regular vacuum in filter mode followed by a backwash, you shouldn't loose as much chemicals. But after a few days not a bad idea to check.
 
Day 10 of slam. Still have algae accumulating around seems, etc an hour after brushing. Water crystal clear. Brush 1-2 times a day, test water 4-5 times a day. I'm afraid the big issue is what you see in the pic: in deep end, when you try to brush this, its rough, like sand paper. This large spot hasn't changed in size in the 10 days. I feel like this is the "seed" to my algae problem. Any thoughts appreciated.algae.jpeg
 
That spot that doesn't brush off is calcium scale with dirt and algae embedded. Ignore it for the SLAM and you can address it later when the SLAM is complete

1. There is no reason to vacuum to waste.....your pool is clear enough to vacuum to filter from here on out.....stop wasting the water.

2. Everything we teach begins and ends with current test results. Would you post them for us, please?

3. Don't worry about DE just now. Your sand filter is perfectly capable of clearing your pool.

4. When did you last backwash? Are you monitoring filter psi? What is it currently?

5. At this point testing 2-3 times daily (at the same time of day) is perfectly adequate
 
4. back wash to waste this am..for 3 mins. PSI hasn't changed in a week or better in filter running about 12
2. I assumed the only test results relevant during slam is FC, which was 11 this am, target of 12. CYA tested 4-5 days ago was 30.
thanks for your input. I don't know why but I hadn't thought of vacuuming thru filter that way. Makes sense!
 
If your psi does not go up (by about 25%) there is no reason to backwash. What indicator do you use to perform backwash?

There is something about your SLAM that I can't quite figure out. You should be clear by now so something is amiss.

Are you running your pump 24/7?

Are you brushing at least every other day?

What size (diameter) is your sand filter? What size is your pump? (hp)

(by the way, filters are not "growers of algae".......algae needs light and doesn't flourish in filters.)
 
Still have algae accumulating around seems, etc an hour after brushing.
Click to expand...
So that (by the way TFP thinks) means your water is not clear.....not yet.

Yes, I think a complete set of test results would help us get a better picture....like this

FC
CC
pH
TA
CH
CYA

At his point, good idea to do an OCLT tonight and tomorrow AM.......OCLT
 
pump is 1 1/2 hp. not sure on sand filter but enclosed a pic. Only other thing that's happened was the lid on pump basket was leaking. I was getting air in line. I replaced that yesterday.filter1.jpeg
 

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