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I have attached a photo of something growing on my concrete pool. It is soft, and a dark green color, although photo makes it look almost black. It grows generally on the north side of the pool, starting on the steps. My water chemistry has been good throughout the 6 years I have had the...

update: Day 1 5pm fc 0.0 added 4 lbs of dichlor and 1.25 gal of 10% hypochlorite (target fc 10) 8pm fc 3.5 added 1.25 gal of 10% hypochorite, ran out, pool store closed Day 2 9am fc 1.0 added 2.5 gal of 10% hypochlorite (target fc 10.0 as per chart) 10am fc10.0 added 0.4 gal of 10% (target fc...

Re: lifespan of cya OK, so here is what I have done so far: Day 1 5pm fc 0.0 added 4 lbs of dichlor and 1.25 gal of 10% hypochlorite (target fc 10) 8pm fc 3.5 added 1.25 gal of 10% hypochorite, ran out, pool store closed Day 2 9am fc 1.0 added 2.5 gal of 10% hypochlorite (target fc 10.0 as...

Re: lifespan of cya I am using tf-100 test kit. Richard320 said dichloro adds to cya, but I don't know how much. And I am low on cya (20ppm). The bucket test is a scaled down version of my pool, using 2.5gals instead of experimenting with my 25,000 gal pool. So I am adding 1/10,000 of the...

Re: lifespan of cya OK, I added my location, Tallahassee, FL to my signature. I was guessing that my initial cya was zero because with the cya tube up to the 20 mark, I still clearly see the black dot, without any cloudiness whatsoever. I just had water tested at Pinch-a-Penny to double check...

Earlier this summer, my pool was doing great, with swg set on 20%, fc at 3, cc at 0, cya at 25. After returning from one week vacation, I found fc at 0,cc at 0.5, and cya at 0, and a little algae on side wall of one corner of the pool. I bumped the swg to 40% and started adding 7 lbs of cya...

skimmer is 67F, probably colder at the bottom; air closer to 80F. Jumping in at 75F.

Today was 71F. Hoping for another day or two of heat to raise it to 74 for one final dip.

I recently built a pool, and decided against the in-floor cleaner for cost issues, and because I thought I wouldn't need it since I was getting a motorized cover. Now I am glad I didn't, because of what you pointed out. Also, my polaris picks up a lot a leaves, acorns, and pine needles when I...

Here is a link to a freon/water heat exchanger:http://www.aquaticeco.com/subcategories/3037/Polar-Eyes-Ti-Tech-Heat-Exchanger In north Florida, I start running AC in house in mid March thru October. In the non-summer months, I can discharge the heat from the house a/c in to pool. That's free...

88F in sunny Tallahassee, but my pool is partially shaded, and covered most of the time.

I asked for something like that in my recently built pool, and the contractor said code prevented any potential connection of house(city) water to pool water. So he laid an extra 1/2" pipe connected from the house supply directly to the top of the inside of the pool wall, above the overflow...

Just tried to test CH in my new pool filled with city water (Copper .668 ppm) with the tft100 test kit, and the pink solution precipitates into slightly purple particles, with the solution becoming almost clear, but will never turn blue. Is this amount of copper causing this test to fail...