"I feel your pain!" I too have had a very frustrating season trying to get my pool usable. I have shocked 3 times and ready to do the 4th. Everytime I shock I have an equipment failure the next day and lose circulation for several days making the shock tx useless. Chemically, mine has been OK mostly, I had to increase Alkalinity and thanks to this forum I used baking soda from Costco (12 lb bags). I was amazed, it worked, and so easy. This start up w/ "old" H2O is new to me, My pool has been in my family for 60 years, my grandfather built it. But the pool had to be cleaned, repaired, repainted every year. This last year it held H2O all winter after spending 3 years prep-ing and sealing with a liquid rubber based patch and pool sealant. It is cool that it worked, but I was clueless on pool chemicals. I have been in charge of this pool for 30 years and have never shocked it, used an algicide or any other chem except granular trichlor, maybe 2 C / day. But I used brand new H2O every year in a pristine pool. Easier to maintain clear/clean H2O than to fix dark green (my fish pond is much clearer than this) water. I have been making up stuff to do that requires getting in the pond and kinda hang out with the fish to cool off. I am tempted to put Koi in my pool, no more chemicals, lots of filtration, but then I could just con't to swim with the fishes in a 30,000 gallon "pond". I guess that would be awkward to invite guests to swim in your pond, but it would be a cool place to teach scuba lessons, classroom complete with fish, alas, no coral. I could put in some giant TN catfish then tell the students that it is a shark. I know this has been :blah: , I got carried away, but it was nice venting my frustration with a fellow newbie