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It is a positive, now you are ready to perform the overnight test. Last night test was invalid because of your CC of 1.

That is a lovely shade of green.

Combined Chlorine means your chlorine is still working. oxidizing something in your water, or most likely in your case, still fighting algae. No FC loss overnight is difficult to explain in this situation. Either the accuracy of your test is off, or you do not have enough FC to continue...

From the pool school The BBB method recommends testing Chlorine and PH daily. TA, CH, and CYA weekly. Your kit doesn't allow you to test CH or CYA, both are extremely important if you are going to have a trouble free pool. It is also beneficial to know what your combine chlorine levels are...

The calculator will keep telling you to change the water as long as your CH goal and CYA goal is less than actual values. High calcium right now isn't a big issue for you, since your PH is low. Look at the bottom of the pool calculator, at the CSI number. As long as you are between -0.6 & 0.6...

So if you are only adding 4.5ppm of FC to your pool per week what are level are you maintaining FC at? Or do you mean that an 8-oz tab supplies 3ppm of FC a day for 4 days?

Keep the pump running 24/7 until you pass the overnight/cc test.

How are you getting your CH to come down? Has it been raining constantly? That's the first time I've seen google docs.. that's pretty cool.

Does your pool have any drains? I wouldn't be too worried about vacuuming up foreign bodies... they have to come out sooner or later, one way or another. You could go scuba diving & drag the bottom. Drag your leaf rake across the bottom. Or run your vacuum along the bottom. I'd go for the...

JamesW provided this for me in another thread. You should check it out. As far as calculating the volume, I would just guestimate using the guestimation calculator at the bottom of the pool calculator. I've read on TFP somewhere, it's not rocket science. Treat your pool according to the...

I don't know about the borates & your TA. But if I were in your situation my first thought would be to dose the pool with muriatic acid until I got the TA down to the low end of the acceptable range.... 70. Unless you are losing copious amounts of water I think you should be able to manage...

Not that I'm an expert, nor do I think my case is/was typical. But in this thread I detail my latest adventure. My pool is only 21000 gallons & it took me 6 gallons of muriatic acid to drop my TA from 250 to 80. Before I added the last gallon, my TA was 110. PH was still greater than 8. Even...

Found this in another thread. If this is true, & I have no reason to believe it isn't, then I understand why my pool builder was confounded with the sudden rise in TA. He left me about two weeks worth of Tri-Chlor. I used them till they were gone then started using liquid bleach. That's...

Newest numbers. TA: 80 I didn't add any muriatic acid Ph: 7.0 retested my CH: 325 using the less accurate (10ml sample) method. It splits the difference between my previous 270 & the pool stores 400. Putting these numbers in the pool calculator, it suggests I add 99 oz. of baking soda. 122...

Getting ready to go test again. If the TA is still not at 70, which I feel it won't be, I'll be adding another gallon of muriatic acid. I suspect it will be in the 90 range. The CSI at last test, was 0.16, PH was 7.6 I'm sure the 7.6 will have gone up by now..... adding more muriatic acid and...

Too cool. You guys are just way too cool.

Whoops. I added another gallon of muriatic acid to the pool. I wanted to get my CSI below 0.6, so I was shooting for a low TA. with my current numbers, my CSI is already 0.16 according to the pool calc. It was 1.3 with my previous readings. I guess the lower Ph affected the chemistry more...

Good to know. In the last four days, I've dumped 6 gallons of muriatic acid in the pool.

Latest numbers. FC: 4.2 CC: 0.0 TA: 110 Ph: 7.6 AD: 7 drops I think I should add, that for the AD test I'm using a goal of 7.0 until a few minutes ago, I didn't know any better. So all my AD numbers have been for a desired ph of 7.0 (which of course, I don't want) so the actual AD is not as...

Still reading through the Pool School. Still learning. Figure I should tell you my pool has borates in it. I don't know how much, Monday I'll see if they sell something at my pool store to check it. But I know for sure my pool builder added sodium tetraborate to the pool .

Could this also explain a CH number of 270? My original test with my K-2006 was FC: 3.4 CYA: <30 TA: 50 PH: 8+ CH: 160 CH went from 160 to 279 in about 4 weeks. I was using Tri-Chlor to for chlorination for 2 weeks, then switched to chlorine. That, I'm sure, explains the rise in CYA.

That's what my builder said after the service rep told him my heater was scaled. I wish he would have put more importance on it before, like told me when he turned it over to me. Good info.... If I knew then what I know now. I asked my builder about the dust I saw when I brushed the pool, he...

Dang..... I knew I shouldn't have asked :-D

By the way, when the pump isn't running, the water is very, very clear. I can see the bottom (7.6 ft) with much clarity & detail. I was reading the pool school, and realized with a new plaster pool, I should be brushing the sides & vacuuming daily, which I haven't been doing. I have been...

That may be the case, it is a new plaster pool. I also have 5 return jets, all of them are pointed towards the surface, causing ripples in the water. I've got a raised spa, with 4 aerating jets, and a spill over causing a water fall effect. Should I redirect the 5 pool return jets so they do...

My K-2006 only goes up to 8, the color is quite a bit darker than 8, but I'm just saying 8+, or 9 knowing it's way out of wack. My most recent TA test shows 130.

OK, I just retested, vacuumed my pool, & cleaned my filter, strainer, and pump strainer. My most recent numbers are FC: 2.8 CC: 0.2 CYA: didn't check, last reading (yesterday) 55 TA: 130 (pool store checked yesterday said 200) PH: 8+ CH: didn't check, last reading (yesterday) 270 (pool store...

I also have a raised spa attached to my pool, the spill over creates a sort of waterfall. Would this aeration also cause my PH to rise & stay high?

I am not shocking to fight an algae problem, but I am trying to raise my chlorine level.

Let's say my Ph is off the chart. Greater than 8. I added 2 gallons of muriatic acid this morning, around 11:00 am. I just retested, my Ph is still showing to be greater than 8. I also did the Acid demand test, 19 drops. I'm thinking something is not right. I dumped another gallon of...