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Thanks Texas Splash! Question on SLAM, recommends to test often, no less than 2x per day. Is there a way to cut back on amount of regent used in drop test?

So after 5 drain and refills the pool is beginning to clear up even though it’s still green in the deep end. Latest test results. CYA - 60 FC - 5 CC -.5 TC - 5.5 TA - 120 PH - 8.2 Based on the Chlorine/cya chart I need to bring shock level up to 24ppm, which equals about 6 gallons of 8.25%...

Thanks Tim and Kim. Should have thought of that Catanzaro. I’ll give it a shot. I’ll do another CYA test after dinner. Pools almost full.

Pump ran all night. CYA this morning was 150. Back to draining. not sure why I can’t rotate it. sorry.

Water is a over skimmer level and I stopped filling. Added a gallon of bleach and will retest CYA in am.

I drained it down to 2 feet in shallow end and refilled. Added a gallon of bleach tonight. At what point should I retest CYA? Is it important to maintain FC Levels relative to CYA during the drain & refill stage? Definitely need to slam after this, pool is getting green.

Thanks for the clarification. Pumping to waste now and I’ll keep the thread updated with progress. TFP!!

Water source is from the city, lake fed. I did wipe the bottle with a damp paper towel between drops. I have been using baking soda to raise PH. At the time I didn’t realize Borax was an option to raise PH without raising Alkilinity? Guess I’ll start draining. I’ll take the CYA to the 60-70...

Test kit came early! CYA - 160 - used the 1/2 pool and 1/2 tap water method FC - 21 CC -.5 PH - 7.2 TA - 130 CH - 125 Pool math says I need to replace 75% of the water. OUCH! Any advice for this with for a vinyl pool? Guess I need to start here and get my CYA levels good.

Catanzaro, Thanks for the advice. Speed stir is on its way as well. Looking through the Pool School info, I didn't see any numbers for draining and refilling based on high CYA levels. If my test reveals high CYA levels anyone have an idea of how much water needs to be replaced? thanks again!

TF-100 is on its and way, with speed stir. Been adding a gal of bleach each day. I'll post back with test results. Thanks again TFP!

Why is it necessary to lower PH before SLAM?

Thanks for the advise thus far. I'll get a kit on order and go from there. Is the idea to add bleach daily to keep the FC up in relation to the CYA? Do the pictures look anything like mustard algae?

New pool owner here. We live in Mobile, Al. We have a 24,000 gal vinyl pool with a sand filter. Being a new pool guy I didn’t know all the essentials to maintain a pool and the Chlorine level dropped and we had algae. It’s been a couple weeks and Leslie pool store said we have mustard algae...

Good afternoon everyone, We’re a Coast Guard Family and we just moved to the Mobile Al area and are renting a house with an in ground, 24,000 gal, vinyl pool. Kids love it and it sure helps with the summers down here. I’ve been lurking for a while trying to find answers to my possible...