I don't want to get into the details, but someone else was watching my pool while I worked out of town this week, noticed my pool was cloudy and tried to be helpful by throwing a bunch of dichlor shock in earlier this week, didn't chlorinate again, and now that I'm back for the weekend my pool is green and my CYA is up from 50 to about 75...
If there were sitcoms about TFPC pool owners, I imagine an episode would go like this week did.
So anyways, now I'm draining about half my pool water. First time I've had to drain my pool, so a few quick questions:
1. It's a plaster pool, and it's the evening. Do I have to change the water incrementally, or can I do it all in one go?
2. Is there any drawback to using a submersible pump over my pool pump? I have a sump pump that I got for cheap at Harbor Freight, and it seems like it would be a better idea to put the wear on that rather than my pool pump. Besides, I can water the lawn and garden with the submersible and now feel like I'm wasting 10k gallons of water.
3. Speaking of watering gardens, is there any issue watering with green water? I really don't want to waste the chlorine reshocking my pool at CYA levels this high. Half my garden gets watered by back flush run off once in awhile anyways, it's just seldom this green.
4. The big question : how do I determine where to place the pump to get a 50% change? Since the pool depth goes from 3' to 8' it will look half empty far before it actually is half empty.
5. Is there any truth to the statement "most CYA collects at the surface of the water, so draining from the top keeps you from having to change as much water."? I'd never heard it before, but it was in my newspaper last week and I found it while I researching whether or not there was a water change ban in effect in my city (there's not, and I was surprised to read about CYA in my local paper as obscure a subject as that is).