To give you a little background or run down of what has been happening:
I manage a small private pool... it's around 40 years old & year after year we continue to just barely keep running, due to age & lack of experience running it (ME -LOL!) It is a 75,000 gallon pool, we have had 100+ temps for 20+ days. We use well water & always have high alkalinity according to health inspector (he says due to the well water, & to costly to control), I used strips to test but changed to a Wal-mart water tester, my chlorine & pH have been running normal, we started to get a slight greenish tinge middle of last week, but normally when I shock the water gets very cloudy for a couple days so, I opted to wait a few more days as had pool party. By Saturday 6/14 getting pretty green, shocked that evening, looked to be improving but was cloudy, Vacuumed Sunday & Monday, Tuesday looked worse again... so then by suggestion I used Algecide, then Wednesday & Thursday Vacuumed again, thought it was improving, Friday-nothing, so then today Saturday 6/21, the pH to high & very green can only see about 8-10" down & water is feeling slimy (Needless to say we closed!) put a "pH minus" in, chlorine level looks to be ok. I am so stressed & we have spent so much money, I am trying to figure out what the next step should be or where to start to remedy the problem!! Please Help!!