Pollen or mustard algae? New pool owner struggles

DMac22

New member
Jun 29, 2021
2
Indiana
Pool Size
28000
Surface
Vinyl
Chlorine
Liquid Chlorine
Hey All- Long time reader, first time poster. This winter I purchased a house and inherited my first pool. During winter time we didn’t have anyone able to inspect the pool due to the cover being on and everything winterized. Come to find out the pool hadn’t been opened for like 2 years. I think my old pond looked cleaner unfortunately. Since April I have been fighting to get this thing cleaned up and clear. After a ton of reading on here it helped me to get basically to that 95% clean point but now I am struggling. I originally had tons of green algae and probably drug 10-15 5gal buckets full out of the deep end of the pool in mid May. After that I was able to see the deep end floor and worked to vaccuum out the last bit I could see. Since this I get this patchy brownish buildup around the pool. It builds up in any area that has a seam, crevice, or lower flow area. Also it will coat the floor semi evenly so that when you broom anywhere on the floor it will give you a nice little brown/yellow puff. After I broom, all of it will suspend towards the deep-end to where I can’t see the bottom anymore and add a greenish brown tinge to the water. If I keep up on this daily it seems to get better. Backwashing multiple times a day because I feel like it gets spit back into the pool once the filter gets saturated so much even with the pressure not rising. I was determined this was mustard algae, followed a 4-5 day SLAM + a day of extra high to account for the mustard algae. Water never really improved much but had less than .5CC and 2 straight days with 0-.5 OCL. That was last weekend and was able to get my family into the pool for the first time, with “slightly” dingy water at the deep end, shallow end was perfectly clear. As I’ve sat at a more balanced level of chlorine and balanced out my other levels + recent storms, it seems the buildup is coming in stronger. It never got 100% clear but I assumed this maybe pollen so it won’t till I get it out.
I have added a cellulose product to the skimmer to help the sand filter catch finer particulate. Seems to help a little. Ordered some skimmer socks that came in today, wanted to try that also. The robotic vacuum I put in the fine paper style filters, they came out yellow after a cycle in the pool lol.
Looking for some advice for a newbie that is well frustrated… any help would be much appreciated!
PS- my pool is surrounded by trees unfortunaly. Another reason I think maybe pollen.

28,000gal w,Hayward sand filter (new sand)
TF100 kit with speed stir
Used up inherited Trichlor pucks to help add CYA, now 100% 12.5% liquid chlorine

7/7/21 1:49p
PH 7.6-7.7 (added soda ash yesterday, to raise 7.3 ph)
FC 4 (still learning morning to night chlorine loss to make sure my levels are stable for swimmers so I had to add some after this check).
CC .5
TA 130
CYA 35
CH 150
 

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Welcome to TFP! :wave: It sounds like you never really completed the SLAM Process. With a CYA rounded up to 40, your FC should be maintained at "16" until you pass all 3 SLAM criteria. That's the key. Before increasing the FC, be sure to lower the pH to about 7.2 first as noted on the SLAM page. Follow that SLAM page and you should see better improvement. Good luck!

 
Welcome to TFP! :wave: It sounds like you never really completed the SLAM Process. With a CYA rounded up to 40, your FC should be maintained at "16" until you pass all 3 SLAM criteria. That's the key. Before increasing the FC, be sure to lower the pH to about 7.2 first as noted on the SLAM page. Follow that SLAM page and you should see better improvement. Good luck!

Thanks for the kind words and the advice. Going on day 10 of the slam and all 3 criteria are pretty much met! I have also been using skimmer socks to help catch the pollen which is helping tremendously as well. It seems it was a bit of algae, pollen, and just debris that was being broken down. Daily vacuuming then backwashing + SLAM + skimmer socks were my cure. I’m hoping after bringing the levels back down hopefully we can keep things clean. I have way way too many trees around this pool!
 
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