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The reason I asked about how you drained was in case this was somehow done with pool plumbing, so perhaps a valve was left slightly open, or a siphon effect was still ongoing... However, if you used a sump pump, and then removed it afterward, that idea is a non-starter. Perhaps the junction...

By what method did you drain down to your desired water level (just below skimmers, as you said)?

Matt, I don't know anything about balneotherapy, but I do like math, so... just a question about the above calculation - 2.3% ( x 10,000ppm/%) = 230ppm I agree that 10,000/1,000,000 is 1%, so that looks right. What happened to the extra 0s in the multiplication, though? Why isn't the result...

It sounds more like a leak... 12" of water is a lot; that much water can't just have disappeared into the plumbing. Did you have any signs of a leak during the swimming season? Does the pool have an auto-fill?

I thought it was a brief and humorous concession 'speech' :D Plus photo to help out future readers as well as the OP :goodjob: I'm still trying to picture the flow path; i.e. how the filter apparently still functioned as a filter, but with the DE on the inside of the grids...!

One drop on the 10 ml sample means 0.5 ppm for FC. If your K-2006 is like mine, there are instructions in the lid of the box... with the 10 ml sample you multiply by 0.5, with the 25 ml sample you multiply by 0.2 For the CYA test, the more CYA your water sample has, the cloudier the...

Thanks for your input! I was beginning to think this was the case - i.e. that these in-water alarms are on the market primarily to satisfy regulations, rather than to effectively increase safety.

I'm having a few regrets about leaving the pool up to wait for this 2-speed pump (which won't arrive now until tomorrow, according to UPS tracking). With a forecast for temps below freezing last night, I was outside around 11 PM putting the plugs into the pool inlet and outlet points, and then...

Well, a weird and interesting story for sure! Also interesting that another poster had basically the same experience. Did you get heater bypass valves plumbed in while they were correcting the error? Or did you not see a need for the bypass function (question addressed to the original poster)?

Appears to be in South Africa...? 4-6 cm water loss in a week is quite a bit. Depending on the climate, it might indicate a leak. If the weather is hot and dry at the moment, it might be normal. Try doing a 'bucket test' -- essentially filling a bucket with water, setting it on a step in the...

Are there any units particularly recommended for this purpose? To be honest, I don't think such an alarm is all that useful in our situation - we are on a back lot, way back from the road, woods in back of the property, and older neighbors (no children) on both sides. That might lead us to get...

Here it is: AG105.7 Pool Alarm. No building permit shall be issued for the construction or substantial alteration of a swimming pool at a residence occupied by, or being built for, one or more families unless a pool alarm is installed with the swimming pool. As used in this section, "pool...

I recently got information from our town's building department, regarding requirements for AG pools... like many owners of a 'blue blob' pool, we are starting to think there may be a larger, permanently installed AG pool in our future. The electrical, bonding, and fencing requirements were all...

The 2-speed pump has been slow to ship, but tracking now says it should be here Wednesday, so I probably will give it a quick try when it shows up. The pool is still up, and we have no frost warnings in the forecast for the coming week. So, I'll probably be packing the pool up around Halloween...

I was thinking more that the sand might be too fine for pool filter sand. If the filter is indeed almost empty at this point, perhaps you should take the opportunity to inspect the laterals for damage or cracks that could be allowing the sand to pass. When you changed the sand, maybe some of...

How are things going? Are chlorine levels doing what you expect after adding bleach? In a previous post you mentioned possibly adding more CYA. You'd probably want to wait with that until you are sure there's nothing growing in your pool (always a possibility when there has been a period of...

So, perhaps your new sand is not actually the proper size for pool filter sand. Have you been vacuuming up the sand that ends up in the pool? I wonder, if you were to vacuum to waste instead, whether the situation would improve over time - essentially getting the smaller sand grains out of the...

Thanks for following up and reporting back on your less-than-pleasant experience! Hopefully it will help a future reader. Probably a dumb question, but why wouldn't it just have worked to close the valve near the pump end, and then put water in the pool (without doing anything at all at the...

Have you made any changes in the filter lately, any maintenance, new sand, anything like that? Is the problem of sand getting into the pool of long standing? Or is it something new?

High FC (above 10 ppm) will tend to make pH read falsely high... so not in the right direction to explain the effect you are seeing. Did you add more potassium carbonate (that was the chemical you mentioned in the original post, I think). How much more? Oh, and what did you use to...

One other thing I meant to point out is that pool store testing is generally considered unreliable; we have much more faith in the numbers you get yourself, with your own quality test kit. This opinion on the forum is based on observation -- i.e. over the years, many many people have found that...

Hold on, please, before adding more stuff... Phosfree is not generally recommended around here (it is unnecessary if you maintain adequate levels of chlorine). And why would you want to add more calcium, when you already measured more than adequate CH at 310? What was your test result (with...

Are you saying that no source of chlorine has been added for the past 3 weeks? If so, I'm a bit surprised that your FC is still at 6, as you measured it. Do you know what form of chlorine was usually added by whoever serviced the pool? I'm not doubting your measurement; just trying to get a...

OK, a bit embarrassed to admit it, but I did buy the 2-speed pump on Amazon this morning. Just looked like too good a deal at that price (~$132)! Good luck with your survey of prices and equipment through the coming cold months! When I look back, I had actually been keeping an eye on pump and...

Well, I just made another Amazon purchase: Amazon.com : Hayward SP15922S Power-Flo Matrix Above-Ground Pump 2-Speed : Swimming Pool Water Pumps : Patio, Lawn Garden That is a 2-speed Hayward Powerflo Matrix pump, 1 hp size, currently on sale for ~$132. I had been thinking of getting a 2-speed...

I am actually quite tempted to buy the 1 hp 2-speed pump you mention. I had previously looked a bit at getting a compatible 2-speed motor to swap into the pump that comes with the 21" filter setup (was thinking of doing this a year or two down the road). The best price I found so far on a...

More specifically, though, what test kit are you using? Reason for asking is that advice/recommendations here are based on accurate test results, so it's important to be on the same page as far as testing methods.

This makes no sense to me. What do you picture filling the line after the air 'disappears'? I may simply be misunderstanding your point.

Re: Filter & Pump Upgrade Yes, the pool is more of a whirlpool than it ever was before (other than when my kids swim/run around in circles near the outer edge of the pool, which far outdoes even this pump :D part of the fun of the game is to sweep non-participating swimmers off their feet...

Well, I'm having the darndest time getting my camera to talk to the computer; have also tried emailing cell phone photos to myself without luck so far. Anyway, I still plan to post some pictures when I figure out those issues. As for setup, given the lack of instructions that come with the...