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It's possible that's all it was this time, no way to tell with the sketchy powder. However in the past though with good powder I saw major FC drop.

So got my new dpd powder in and the verdict is: old powder was bad. New powder showed 20ppm at the end of a VERY hot day here and not adding anything since last night. Ran a test right behind it with old powder and it gave me a reading of 13. So I'd venture to guess I was bringing my FC to...

Sorry I didn't read the previous messages from overnight.

The TFP shock chart says 20 for CYA or 50??? The Free Chlorine and Cyanuric Acid Relationship

Man I think you're right. I don't think I can trust this stuff at all. Getting different readings and takes the sample awhile to turn red even with my magnetic mixerI. can't wait to get the new stuff in tmrw so I can actually see how much chlorine is actually in my pool right now. Saw a...

Yes FAS DPD, all I've ever used. Powder is expired, I ordered more. But it seems to be working. When I add two scoops it turns red and I'm adding the expected amount of drops (example, I add a gallon and I see an approx 3ppm increase). Chlorine is straight off the shelf from Walmart, 10%...

Thanks. I'm not going that much above SLAM level. Just enough margin so I'm not testing every 10 minutes. But it's eating chlorine like crazy. I've added 6 gallons in the past 4 hrs just to keep it around 20ppm (it dove down to 15 in the span of 2 hrs). Pool has been crystal clear for the...

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I keep my FC around 4-6ppm. Strangely it was testing in range when the algae showed up. This happens to me annually like clockwork. Once I get rid of it, it rarely returns the same year unless I have an equipment malfunction. I swear I'm snakebit with this pool. Had same issue when I was on...

And failing OCLT by around 8ppm daily.

If anyone would be willing to talk voice DM me. I'm pretty desperate but I consider myself a true TFP disciple. Also any reason why boric acid wouldn't help in my situation?

Where would ammonia come from? I don't add anything to my pool other than salt.

I ordered straight boric acid powder.

About two dozen gallons per day to hold at 20ppm

Yeah you read it right. Pool is crystal clear but I have battled this for years know and can spot the mustard algae in a heartbeat. I know it sounds crazy but I get the FC up over 20 and hold it there, but it drops VERY quickly. I'm adding 4 gallons every few hrs. Here's my DPD test method...

Hey Duraleigh. Really do appreciate the feedback, however I've been following the TFP method for years now. I monitor my FC and CYA religiously and yes, I have all the test kits. I only test with DPD powder and reagent.

My pool is near a pond. The wind blows and I get a MA outbreak if conditions are right. This time my GFCI breaker tripped and my SWG went offline for a day or two. That's all it took for an outbreak to happen. I've been slamming for four solid days and have added 75 gallons bottles of 10%...

Deep south saltwater pool. Random winter weather swings. Do you run your saltwater generator all winter? If so, lower chlorine output? I have a 20x40 pool and a variable speed pump that I typically leave running 24x7. Wondering if I should drop the output, drop the run time or both...

I run my VSP 24x7. SWG kicks in at a certain flow rate, which equates to approx 18 hrs/day.

33K gallon SWG pool. Considering adding borates as an extra algae buffer. I test my water about weekly, but sometimes life happens and we forget, lose power, etc and the dreaded bloom occurs. Seems to happen once or twice annually (very early spring is always prime time, or inevitably we...

This turned out to be the source of the leak.

Found A leak (not sure if it is THE leak) however it's leaking behind the light at the grounding screw and cord hole. I tested this prior however I didn't get the dye close enough to the hole to see it get sucked in. Apparently the dye test only works if you get it right on the hole. Anyway I...

So did another test and it appears it's leaking with the pump off as well. I think it rained during my previous test and skewed my results. So appears next step is to plug all returns, skimmer and drain holes. What does one normally use to plug these? I can buy the threaded plugs for the...

Yes, several times.

Posted this in another forum but this seems to be the right place for it. 20x40 in-ground pool. I'm losing 1" a day. Bucket test tells me the leak is outside the pool as it only seems to lose water when the pump is running. It's not the discharge line. No wet spots I can see anywhere. I'm...

No issue maintaining pump prime. I found a DIY pressure tester kit on Amazon, has pretty good reviews. It's $219 and it looks like about $25 worth of parts, works with a standard air compressor.

Been chasing a leak. Realized it after regular salt and CYA loss. I know it isn't leaking out of the discharge/backwash port or any of the above ground plumbing/filter/pump. It also seems to only be when pump is running as I pass the bucket test with the pump off. I assume it's underground...

Found algae behind pool light during SLAM. Also under the ladder steps. Is there any way to fill the void behind the light to keep algae from hiding here? If I had my way I'd have no pool light or ladder.

Do you have experience with this particular model?