This looks like an awesome site and I'm glad I found it. I've had my algae problems off and on over the years which I usually managed to deal with most effectively with copper algecide (I know that is a bad word here). However, the last 2 years I've had trouble with reading any chlorine on my simple DPD test kit. Although my pool store has been in business as long as I have had the pool, they haven't been too helpful lately. Last year they told me it was because I had excessive phosphates in the water and sold me that expensive phosphate remover. I actually did get a free chlorine reading after that for awhile.
A few weeks ago, my pool was cloudy and I shocked it with my usual 2 lbs. of Dichlor (I had had a heavy load for a few days). When that didn't work I tried 4 lbs.. After a while I finally went to the pool store and they told me to add a gallon of 12 % bleach and check for FC after 12 hours. I went through 4 bottles and still no FC. Then I went to their other store where they sold 10% bleach for more than the 12% (ouch) and went through another 4 bottles and still no FC. However my pool water had cleared up and is still clear. So a week ago last Wednesday I went on the internet and found this site. I went through pool school and have read many of the posts, especially those with CYA of 100.
So last Thursday I went to Sam's and bought some bleach and using the calculator added 7 jugs of 182 oz. bleach. I also ordered the TR-100 test kit which as it turns out comes from about 20 miles up the road and I had it the next day. In retrospect I wish I had waited until I got the kit and learned a bit more. So here is what I have going on the last few days.
On 8/7 in the PM I had:
FC 5, CC .5, TC 5.5, PH 7, T/A 100, CH 220 and CYA 100?
Other than the chlorine numbers the rest of it agreed with the pool store's numbers. As I recall I did a chlorine drop test the next morning and FC was at 4. I can't find the piece of paper I wrote down my 8/8 readings. I wanted to start keeping the data in a spreadsheet sionce the log with the test fkit would soon be filled up. I also added the rest of the PH+ stuff I had and my PH is now up to 7.2 Starting on the 9th I had.
a.m. FC 3 CC .5. At 5 pm I added 2.5 gallons of 182 oz. 6% bleach checked it at 7:30 and it was 10.5.
On the morning of 7/10 my FC was 5 and the CC was .5. So I lost 5.5 parts of FC overnight but CC hadn't changed. AT 5 pm my FC was down to 2.5 and my CC had increased to 1. So I added 3 gals of the 182 oz. and a recheck at 6:30 showed FC = to 16 and CC was 1.
This a.m. at 7 my FC was 6.5 and the CC was .5 and probably less since I cold barely see any pink. So I lost 9.5 ppm of FC overnight with still not much CC reading. The posts I've seen with losing lots of FC also have high levels of CC. Since I don't I wonder what is happening to it. In fact most of my CC tests have been barely noticeable before adding the one or 2 drops.
So from reading as much as I can I assume you will probably tell me that I need to lower my CYA, shock the pool and keep at it until I get a good drop test. Even if that is true, I have a few problems and questions.
The first relates to measurements. How critical is the "heaping tsp" of DPD powder for the drop test? If some gets on the handle is that "too heaping"? The CLA test is certainly subjective and how do you know when you get it right? The pool store says 100 (twice) but I can get 100 or maybe 80 and my wife can get 120 or maybe 100? I'm 68, maybe that's my problem I tried a 50/50 ratio of pool water to well water last night and it still is hard to tell whether it is 60, 50 or 40.
Getting my CYA down is problematic since my drained water ends up going down my neighbors front yard. Another problem is that I have a well that puts out 4-5 GPM so it takes a long time to refill. I drained out about 4 inches yesterday and it took about 5 hours to refill. It will take a long time to correct my CYA. By the way the pool store checked my water for iron and copper and there was none.
So what I would like to do is do as little as possible for the next 5 weeks until I close the pool and deal with the CYA over the winter when I lose some water anyway. Normally the pool gets little use with just my wife and I and often only a few minutes a day when I jump in after a run. Except for a party next weekend that will be the case until the pool closes. So I was thinking of just trying to maintain FC of 3-5 during the day and perhaps adding some algecide (Polyquat 60) to hopefully ward off any signs of algae. Even with all the problems I've had the last 2 years I have had no one get swimmers ear or any other problems and only one algae growth last year.
Any thoughts greatly appreciated.