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I'll do the timed chlorine test. Please advise: How do I "add 10ppm FC". Do I dump in either shock or Clorox until I read 10ppm on a test strip?

Thank you for these comments. Testing has consisted of two trips to a store as well as daily use of test strips and DPT chlorine testing. In this case, at least, the store results agree with my personal testings. After reading your suggestion about ammonia as an explanation, I used the test kit...

We opened our pool three weeks ago. Two problems. First, the level of free chlorine remains at 0.13 ppm, despite my adding seven gallons of Clorox and two bags of shock. Secondly, the CYA level remains at 25ppm, despite my adding 16 oz of CYA powder and one gallon of "stabilizer". This is the...

Opened our 24,000 gallon pool two weeks ago. At opening, CYA reading = 10, on test strip and using R0013. Gradually added all four pounds of Robelle 2604B Stabilizer. The package claims it is 100% CYA. No change in the CYA level. Shall I continue to add Stabilizer?

Maddie: Excellent point about the sunlight. Add to this the fact that tree branches overhang the pool and further prevent direct sunlight from reaching it.

Two days ago, I shocked my pool. I had to raise the FC level to 12 ppm in accordance with the measured value of CYA. Today, the FC level was still at 9ppm. CC level is 0.5. I have read that the FC level should be in the range 3 - 5 ppm for safe swimming. How do I reduce the FC level quickly...

I caved in and had the pool guy come by today. He took a huge 1 1/2 x 11 1/2 tapered tap from his box, ran it through the thread in the tank, and screwed the plug in until the o-ring seated. No drip. I asked about the apparent discrepancy that had me confused; namely, the straight threads on...

Now I'm confused. Pentair told me the thread on their plug is NPT. And yet it has an o-ring.

I just don't know what to do next. I have two Pentair plugs. Neither seals. I've wrapped them with teflon tape. Still leaks. I've coated the threads with a non-hardening thread sealant. Still leaks. I installed the plug from the inside twice. The first time, no leak. The second time, leak. The...

Would you please suggest an adhesive for this? - - - Updated - - - James suggested gluing an adaptor into the shell. What adhesive should I use?

I called Pentair. Right you are. They identified the thread as 1 1/2 x 11 1/2 NPT. Many thanks for steering me in this direction. Now what to do with the NF tap that I bought! Ask first; buy next. I never learn.

Thanks again for this. But isn't the existence of the o-ring proof that the thread is NF and not NPT? My understanding is that NPT joints seal at the thread.

This is interesting and concerning. I looked carefully at the thread on the male plug and could detect no taper. So I decided it was NF. But I was unable to get a perfect match to the thread with either a 12 or an 11 thread gauge. This fits your statement that the thread is 11.5 tpi. Please...

The female thread for the bottom drain plug of my Pentair CCP320 cartridge filter is stripped. The symptom is that as I turn the plug to tighten it, it clicks and no longer advances. I bought a new drain plug. Still a leak. I wrapped the threads with teflon tape. Still a drip. I went so far as...

The plastic drain cap plug on my CCP320 filter is way too difficult to reach and remove. Also, mine survived four removals before the plastic nut stripped and it impossible to grip and remove. Before investing $35 in a new flimsy plastic one, I thought I'd poll the forum to see if anyone has...

I love this forum. Many thanks for the response. And I hope VA Beach is to your liking. We're fortunate to be within walking distance of the GW Parkway and Mt. Vernon. A very nice area to live in.

I'm about to add household bleach to my pool in the amount given by the calculator. What is the preferred method of adding this liquid? Into a skimmer? Around the sides of the concrete pool wall?

You know, I just joined this forum because I was at my wits end with the pool that we inherited from the previous owner of the house. The company that opens and closes our pool is helpful but not with details. I belong to any number of other forums - vintage VW, hobby machinists, etc. Based on...

I've used up almost all of the CYA test solution in my Taylor kit. All other bottles are quite full. Can I buy a large bottle of CYA test solution as a stand-alone purchase? If so, please suggest a vendor. Thanks.

Because the pool was cloudy for the first three years that we have lived in this house, last year I replaced the existing sand filter with a cartridge filter. My rationale was that the debris in the water was too fine for the sand to trap it. I should mention that the pool is embedded in a...

Where to begin...... Here are the numbers as of a few minutes ago. Free Cl: > 5 pH: 7.5 hardness: 200 CYA: 40 Results obtained with a Taylor kit. Yes, I have added both an algaecide and a "clarifier" last week. In desperation.

Thank you.

I'm new to cartridge filters. I see videos of people cleaning the cartridges by hosing the outside of the pleats. If I understand correctly the circulation in my filter, flow takes place from the outside perimeter of the cartridge toward the inside. If this is so, won't directing the hose flow...

My pool is permanently cloudy. The chemistry measures normal. Pentair Clean and Clear filter. 10 micron cartridge filters. Yesterday, because the pressure in the filter had increased by 10 pounds, I pulled the cartridges and hosed them. Two hours later, the pressure had again increased by 10...