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By chance, is the pressure high? I had a problem with my oversized constant speed pump putting too much pressure on my cartridge filter and basically blowing stuff through. I had a pressure of 28 psi on a clean filter though, so my situation was fairly extreme. If your pool is similarly...

In general, you're right on. Your algae is probably dead, and you simply need to let the filter clean it out. Sand filters can often take around two weeks to complete that process. You're running below shock level for your pool though. If you haven't already done a complete shock and...

Interesting experiment. I'm curious about what kind of other results you are going to end up with. I'm glad to see it working in removing phosphate in an experiment like that. If you do end up flocking with alum, plan on letting the water settle again after the first vacuum. I've had to do it 3...

If the algae in the pool isn't putting any demand on the chlorine, you'll likely be dropping 0.5 - 1.0 ppm/day, which I believe would be around 0.5 - 1.0 cup a day of 10% bleach in your pool. (You can check me by filling out PoolMath on this site.) I would at least add that to maintain your...

Until you get the TF-100, you're largely goign to have to guess. Shock level at your CYA level is around 40 (see this chart). I'm assuming that you are up close to that at least, since you have gone from green to blue and cloudy. The major thing you need to do next is to wait for the...

Also, I believe that the alum I have at home is aluminum sulfate hydrate. I can check just to be sure, but I think that it is. Sent from my SM-G920V using Tapatalk

It likely is cost prohibitive. All of the primary chemicals discussed in the chapter can be ordered inexpensively in bulk. I'd be surprised if utilities pay more than 10% of the cost Leslie's is selling alum at. The other chemicals (lime, ferric chloride, etc.) are also cheap, though near...

I understand. If a fresh truckload is about to come anyways and you don't have present issues, simply waiting it out might be better than the money and hassle that would be involved in using alum, polyaluminum chloride or some other P remover. Sent from my SM-G920V using Tapatalk

I found these test instructions for the Taylor K-1106 test kit. It's clear that the test is for phosphate, not phosphorous, which is the unit we typically use in WW. In that case, my calculation of 9,800 ppb of phosphorous removed per 8lb bucket converts to ~ 30,000 ppb phosphate. You'll lose...

1. A 8lb bucket of dry alum should contain around 12 moles of alum at ~300 g/mol. On a pure molar basis, this would remove 12 mol of P, or 372 g P, pr 1.14 kg PO43-. A 10,000 gal pool is 37,800 liters. 372g is 372,000 mg. 372,000/37,800 = 9.8 mg/l or ppm or 9,800 ppb of phosphorous. This...

From the Water Enviroment Federation's Manual of Practice 8, (which is one of the most common references used by engineers in designing WWTPs) the chemical equation for phosphorous precipitation with alum is: Al2(SO4)3*(14 H2O) + 2 H2PO4- + 4 HCO3 ---> 2 AlPO4 + 4 CO2 + 3 SO42- + 18 H2O Note...

I need to review the math above for equivalence, but I know that in WW we expect to need about 3 lb Aluminum for every pound of phosphorous. This is approximately double what the pure chemistry would suggest, similar to what JoyfulNoise said above. I'm not sure what you cost numbers are from...

I doubt that an occasional use of alum would ever generate concerning sulfate levels (~300 mg/l from here 3 – Sulphate attack | ) like sodium bisulfate use would, but extremely frequent dosing certainly could. You could also acheive the same results with polyaluminum chloride floc without the...

Floc could also help speed up the process of the pool clearing up, but it shouldn't be added until the pool goes from green to blue and cloudy. It's not normally recommended because it can be tough to deal with, but it does work if used for the right purpose (clearing cloudy water.) It doesn't...

Okay, so I want to dive in here. I have not read all of the 300 posts in the thread so far, but I believe I take a different approach to this than most. Professionally, I'm an engineer and I design water and wastewater treatment facilities. Many wastewater treatment plants have to hit low...

My K-2006 came with two bottles of the CYA reagent. Those two white capped bottles in the back are the same thing. That doesn't change the fact that you don't get that much, but you will probably get at least 7 tests out of the kit instead of 3. Also, from this, Pool School - Test Kits...

Thanks. I don't have an existing controller and I think I'm 220 already on a separate breaker, so this shouldn't be that bad. Sent from my SM-G920V using Tapatalk

Thanks. I'll look into that one for sure. The price isn't bad at all. Sent from my SM-G920V using Tapatalk

Hi all, I'm in the market to replace my current energy hog (2HP constant speed Jandy JHP2.0) with a new VS pump. I know my current pump is oversized, and that the lines into my pool are too small. Right now, running the pump without the cartridge filters installed generates a pressure of 26...

You seem to be staying pretty close to shock FC levels, though you might want to add chlorine more often, as pooldv mentioned. You are also getting pretty close to where you want to stay on CYA, so you should switch from dichlor to bleach soon. You will overshoot CYA in the next day or two at...

It's also possible that high FC is messing with the TA test. See the link below to see how another user retested and got drastically lower results. I'd double check your TA results before taking a lot of action to fix a problem that might not be there. Help with these numbers

If you floc now, you'll get rid of a lot of the cloudiness for a very short while. Floc won't kill your algae, so it will grow back and make your pool cloudy again. Your problem is likely high CYA (cyanuric acid) that is reducing the ability of your chrloine to kill your algae. Listing your...

I think it's more likely that they are going green because it's May and the water is warming up. That said, ash will contain significant amounts of phosphorus, which will turn into phosphate in your pool, and that can lead to algae. However, if you keep your FC at the right levels, the...

The easiest way to vac to waste with a cartiridge filter is to leave the top off of the filter vessel. All of the pumped water will simply flow out the top. It'll make a mess, but it will be wasted. I didn't want the mess, so I had to make plumbing modifications to my cartridge filter to add...

Based on the chart, shock level at CYA of 75 would be closer to 30. Pool School - Chlorine / CYA Chart If you are running back and forth between 16 and 20 ppm of FC, you may simply not have enough chlorine in the pool to get the complete kill.

You're going to need a test kit to really know how much FC you need, but certainly don't let it go to zero while waiting for a test kit to come in the mail. Based on the chart (Pool School - Chlorine / CYA Chart), you should be trying to hit 4-5 ppm of free chlorine. Your pool is about 6,000...