New Owner needs help with stains

[jjsmd]

OK , I'm a new pool owner with zero experience.

Bought the house with a 12 year old gunite in ground pool about 15,000 gallons. Sand filter . I'm located in New York and pool has been maintained by a pool service so I really have not had much hands on experience but have been slowly learning from this site and eventually will take over .

Upon opening the pool this season and after cleaning out from the winter the pool has these stains at the bottom whch the pool service claima result of hurricane "sandy" and will have to be draianed and acid washed. I'm just tring to find out if this is the general consensus here as well.

The texture is smooth and I tried brushing it with a steel brush and it doesn't really come off at all.

I'm attacching some representative pictures here

http://i246.photobucket.com/albums/gg94 ... G_2807.jpg

http://i246.photobucket.com/albums/gg94 ... G_2806.jpg


any suggestions as to how I ago about trying to figure this out and best way to proceed would be appreciated . Thanks


Joe

 

[Bama Rambler]

Do you know if they're organic or metals? If you don't know, take a trichlor puck and hold on a spot for a little while and see if it lightens. If it does, it's organic and raising the FC to the top of the recommended level and holding it there will lighten them. If it doesn't lighten it take some vitamin C tablets and crush them up and rub on the stain. If that lightens them they're metals and you can do an AA treatment to get rid of them.

 

[jjsmd]

OK
Thanks for your reply, The trichlor test didn't seem to do anything.

The vitamin C may have lightened it slightly . The stains are really more then just stains , they feel like sand stuck to the floor of the pool.

In the meantime I got the TF- Test kit and these are my initial test results.
cl 5-10 ppm
pH 7.5
Fc 4.5
cc 0.5
TC 5.0
TA 150
CH 350
CYA 65

Now what do I do?

Thanks

 

[duraleigh]

How does your water look?

 

[Bama Rambler]

My first thought is scaling. Since it feels rough, and with your numbers, the CSI is slightly positive, so if the pH has been high before it certainly could be scaling.

 

[jjsmd]

water looks fine , it's just these large brownish areas on pool floor that looks like sand from outside but are actually some sort of discoloration and or deposit on pool floor