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One other thought.... you said you thought you had ammonia.... that is a chlorine hog. I had the problem beginning of last year - clear water and 40 gallons of liquid chlorine later couldn't hold any FC. Got an ammonia test kit from pet store and sure enough that was it. Took me another 10...

Just a couple of thoughts. Sand filter on 42,000 gal will take quite a while to clean out anything you do manage to kill - I'd make sure it's not contaminated. I had a similar problem a year ago... dumped 50 gallons of liquid chlorine in a 21,000 gal pool and couldn't get a FC reading. Turns...

Thanks for the suggestions. I checked this 'red' stuff this morning, and it's not red algae - it's actually pink and dissolves in a cloud when disturbed. My FC last evening was between 2.0 and 2.5. This morning it is 1.5 - not a horrible drop, but far too low and there is some growth in the...

I think so... but I'll confirm in the morning...

It's dusk so not a great photo, but you can see it here. It's all over the cove and steps except for white streaks where my wife swiped it today. Had a hard time uploading an image.... Insert from Computer doesn't provide a way to point to the file, used URL and it kept complaining the file is...

I've been using the TFP system since the middle of last year when I switched from Dichlor tablets to a SWG. My water has been perfect, and was near perfect on opening 6 weeks ago. About 2 weeks ago I noticed some red stuff on the steps and in my cove - both white plastic areas with rough...

I just want to say THANKS for the help. I finished the SLAM and my pool is perfect. You guys are great.

The drain on that filter is on the bottom under the inlet/outlet connections - it can be a pain to get to. Some people use the backwash setting to drain most of the water. If you had water in the filter and/or the control valve and it froze you may have a problem - anything from a cracked...

Update. I got the CYA level up and started the SLAM today. I checked every 2-3 hours, FC would always return to 7.5. I bumped it with 1 gal of 12.5% 3 hours ago and did my numbers again just now for the overnight test. My water is clear and ammonia is gone. Here are my new numbers. PH 7.2...

Thanks. I'll put some stabilizer in the skimmer (filter is running 24x7) and let that process while it rains tomorrow. Do I need to worry about PH yet? I'm a little concerned about playing with it because the TA seems high.

Update. I had 10 gals of 12% on hand so figured I'd give it a try before going through dumping the pool. I added the 10 gals and 2 hours later my ammonia was down to 4ppm. My TF-100 arrived so I did some tests with the following results. Basic test CL = 1 Basic test PH = 6.8 Drop FC = 3.0...

Agreed im dumping about75% of the water

I read it takes 30ppm to kill off 3ppm chlorine. So using the pool calculator that's at least 2000 oz, or 15+ gals of 12%. I'll give that a try and report back. Geez!

Okay thanks for the ammonia hint. I just tested and my ammonia is off the scale. I'm using a salicylate-based test that measures between 0-8ppm. The color was darker than 8 so it must be at least 10ppm. As I understand it, I should not raise the CYA (it's 10 now) and will need to keep adding...

Thanks everyone. My kit will arrive on Monday. Jblizzle LOL the PH is 7.0 I'll test for ammonia today.

Okay I have some readings just taken with my friend's Taylor kit. FC - 0 PH - 130 Alkalinity - 130 Calcium - 150 CY - 10 Where do I start?

Thanks. I'm using test strips. They show no color change/ no FC. I also had the local pool store test it, but they use strips also. I'll wait for my kit and then post actual numbers.

I'm new to the forum but glad I found it. I'm trying to get my pool open and never had this much trouble. Background: I have a 20,000 gal in ground pool with vinyl liner. Hayward DE filter, 1-1/2hp single speed pump. I use a solid cover. We had a warm winter and I suspect that's part of this...