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I was shocking weekly with calcium shock and then I didn't for a couple of weeks and shocked again with liquid because I found some algae hiding behind the light cover. I opened the cover, wiped the lamp and all algae ended up on the pool floor so I shocked again. I can't say if shocking has...

No. Before I had to dive deep with water proof camera case to get the picture. Now they are on steps, just 5" below the water level

but if that was the case, wouldn't vitamin C get rid of the rust? I crashed vitamin c and put it in the sock on top of the brown spot for about 20-30 min. I also tried rubbing the vitamin C tablet against it, didn't do a thing. Also, I used to have may be a dozen of these, but a week later a...

I didn't remove outer shells. The green ones have shells, but browns don't and I assumed that they become brown once shell gets removed. I'm yet to verify if that's the case though. I tried rubbing with a piece of tablet (the small piece from the floater) for about 30 seconds or so on brown...

That's how I test it :). I did not know that I need to wait until it turns blue with no further changes in color with more drops. thanks for clarifying this. My CH changes color at around 550-600, but turns blue at around 630-650.

No, they went to two stores. In fact, these two stores always had very different CH results which was the reason why I joined this site and got TF100. Now both stores have the same CH result of 370, while my TF100 is at 600.. and both have the same CYA result of 60, while I can see the dot up...

Which parameters are likely to get messed up (other then chlorine) if you test your water 30-60 min after shocking? Today I found some algae in the pool on the lamp, behind the plastic cover. As I removed the plastic cover and wiped off the lamp with the cloth soaked in bleach, the algae ended...

Chlorine worked on black dots, didn't work on the green\brown ones. *It does seem like the brown ones are green at first and then once the outer shell gets removed the spot becomes brown*. I have to verify this is the case though. Good point about brushing. I stopped brushing my pool once I...

I don't fertilize. I have these spots everywhere, on walls, floors, steps. They are not just in one spot - they are everywhere. I just wonder if it has anything to do with the way I maintained the pool or it's just a coincidence and not uncommon for 5yr old pools. One thing is certain - I'm...

Pool is about 5 years old. What product is the finish - how can I tell? I may have some papers from the company who built the pool, will have to check if it's there. Also, I didn't have these when I opened the pool. I started noticing them about 3-4 weeks ago. If it is rust - where is it...

Sorry for double posting, but I'm really concerned with this issue and I don't now who else to turn to. I've purchased the house this year. The pool is about 5yr old. I didn't have any of these dots when I opened the pool, had about a dozen a couple of weeks ago but now I have a lot more of...

Thanks a lot for your replies. Now all this makes perfect sense to me.

Pool calc said the 3 tablets would raise my CYA by 4ppm, FC by 6.5, lower PH by 0.35 and raise salt by 5.3 I'm not sure I understand it. Would it affect my water that much regardless of how many holes I have in my floater? I have 3 tablets and 3 holes in my floater and the 3 tablets last about...

chlorine 4-5 (went down by 1ppm today, but it was 95 or so) PH 7.6-7.5 (it may went down by .1) FC 4.5-5 CC .5 TA 130 CH 600 CYA 30-35

I purchased the TF100 10 days ago and fully tested my water 3-4 times since, testing chlorine and ph daily. All the parameters stay the same, even after rain which added ~~3-4 inches, except maybe chlorine level went down by 1ppm. I have not shocked for 2 weeks now (used calcium based shock...

This may be similar to what I have in my pool - I have black and green ones and now some brown ones. I was able to get rid of some black ones with chlorine tablet, but chlorine didn't work against green\brown ones. It seems like I'm getting more and more of these dots since I stopped shocking...

what-are-these-geen-brown-black-dots-t24357.html I have pictures in very first post. I don't know what the green ones are, but chlorine tab doesn't seem to work on those. It does seem to get worse and I'm not sure what the deal is. I stopped shocking pool and haven't shocked it for almost two...

I have some very small black dots in my pool. They are probably 2-3mm in diameter, but I've had a lot of them in one spot, probably the size of 2 quarters. Not sure what they are, but if I rub them with a piece of chlorine tab, covering them up in chlorine they seem to go away after some time...

Also, about the chlorine - is this the kind I can use? Active ingredients: sodium hypochlorite 6% Other ingredients 94% yields 5.7% available chlorine. This "other ingredients" got me worried a little.

Just tested again, 36hr later. Pool is currently running and has been running for about 2hr This time I used speepstir, so I guess my results are more accurate now. Chlorine 6 PH 7.6 FC 4.5-5 CC 0.5 TA 100-120 CH 550-600 CYA 40 It looks like I'm getting more and more of these...

Well, I'm convinced that I can't use my shock anymore. That one store that kept saying that my CH level is OK was throwing me off, otherwise I'd stop using it a month ago. If I stop shocking my pool or will use non-calcium shock, will I get scale at my current CH level? Will I need to take...

Just did the test at the store to compare. CH 650, TA 70, everything else good. FC 5, TC 5 I'll retest my TA to see why such a big difference or stop by at another store if I'll be passing by. The store employee again suggested I get off the calcium based shock right away and move to chlor...