Opened yesterday, had dead algae and other debris on bottom of pool, FC was 1 and CC was 0.5, pH 7.0, TA 80, CA 110, CYA 45, water temp 70. Had to add about 2 inches of well water. Vacuumed & brushed. Super chlorinated up to 15ppm and this morning my FC was 13 and no CC's. Went ahead and raised pH to 7.4, I really don't like the pH to be that low, just a personal preference.

This afternoon, I took a water sample to the pool store to basically have them check for metals. None. But their PinPoint water analysis came up with radically different numbers, and others I don't even know what they are.
Sat Index (-.30 - 0.10) -0.96 CORROSIVE (what the...??)
Total Dissolved Solids (1-1500) 100 OKAY
FC 4.5 HIGH
TC 4.4 HIGH
CC -0.1 OKAY (how can you get a negative CC?)
pH 7.6 OKAY
CYA 16 LOW ("add 4lbs of conditioner, don't backwash for 48hrs")
Copper None
Iron None
TA 21 LOW ("add 20lbs of baking soda: half today, half tomorrow")
CA 94 LOW ("add 25lbs of calcium, 5lbs at a time")

Walked out with some polyquat, and some dry acid for decreasing pH later in the season (I hate dealing with muriatic acid). When I asked the pool lady why I need to raise calcium with a vinyl pool she said: "you need the calcium or it will leech the calcium out of the liner and it will wrinkle". Hmmm.

Came home and immediately retested TA.....tah dah...it is 80.

So my questions are: what the heck is a saturation index and how can it be corrosive, and how can there ever be a negative CC??

While I was there a poor soul came in and picked up 25lbs of calcium for their vinyl pool (a huge bucket!!), pH increaser, another bucket of 3" tabs, and a skimmer bucket....$85!!!! Pool stored.

CaryB
Anyone but Buffalo (Go Sens! SWEEP!)
18x36 IG vinyl; 24K gals; sand filter