Hi, Jake, and welcome to the forum!!
Sounds like you've been doing your homework, and that's a great thing...I know it all seems pretty overwhelming at first, but after you've been at it for awhile, it will become second nature for you.
First things first: How did you add the stabilizer? If you added it through a sock hanging in the return, I would take it out until you get the pool cleared up. CYA of 30 ppm is actually ideal for most situations, and the only way to remove it from the water once you've added it is drain/refill. If you added it by broadcasting, let the vacuum pick it up and get it out for you. If you added it through the skimmer and then cleaned the cartridge, then it's already gone, and that's a good thing.
Second: With a CYA of 30, the chlorine level you need to attain and hold to kill the algae is 15 ppm. You want to get it up to 15 ppm and hold it there as consistently as possible by testing and re-adding chlorine as often as you can. In a 19K gallon pool, each 1 1/2 quarts of 6% bleach will raise your chlorine by 1 ppm. 3 gallons + 1 quart will raise your chlorine by 10 ppm to get up to the 15. So raise it, then add whatever amount is necessary to get it back up to the 15 as consistently as you can. The more consistent you are about maintaining that shock level, the quicker the algae will die off. You need to keep the chlorine at that 15 ppm level until the pool is clear, the difference between your FC and TC readings is 0, and more importantly, when you can measure chlorine at sundown and again at sunup and the chlorine numbers are the same. You can do this with a cheaper kit, using the dilution method that I can give you a link for, but the best kit we recommend for this job is found online at http://www.amazon.com/dp/B0002IXIIG?...NB76D96DJNGM5&. This kit is everything you'll need to keep the pool pristine. You can get it elsewhere online, but this is the best price we've found for it so far, and if you order it from this link, then PoolForum will get a donation from the purchase.
You need to be brushing the pool daily, and run the pump with the filter on, as close to 24/7 as possible. The chlorine will kill off the algae, but it will not remove it from the water. That's what the cloudiness is. Removing the dead algae is the filter's job, and the fact that your pressure rises as quickly as it does is just evidence that it is doing what it's supposed to do. Unfortunately, clearing up algae blooms is a PITA with a cartridge filter, but that's just how it is. Clean the filter as the pressure indicates, and it will clear. Running the pump without a cartridge will recirculate the chlorine, but will not do anything to help remove the dead algae that's causing your cloudiness.
If the Polaris isn't picking up much of anything, then I'd give it a rest for now, but if it's still bringing up leaves, sticks, etc. then let it run, if you can do it safely--the more of the debris that you can get out, the less work there is for the chlorine to do. You might do a more efficient job, though, if you just scoop what you can off the bottom iwith your pole and net. My fear for the Polaris is it trying to pick up something too big or at a wrong angle and damaging the unit, if you can't see what it's running over.
You did yourself a huge favor by not buying the floc and clarifyer that the pool store wanted you to buy--they are not necessary, will not speed up the process, and will frequently create more problems than you already have.
It sounds like you are well on your way to a clean, clear pool--what you're going to need now, besides lots of bleach, is a huge dose of POPP--pool owner patience and persistence. It won't happen overnight, but it WILL happen if you stick with it.
Feel free to repost with any questions you have, current readings, or progress!! BTW, what kind of pool do you have--liner, gunite, plaster, etc.?
Janet
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