Pool is clear but bottom looks spotty and dirty

[rkrgk]

Sounds like a pretty goo idea - it will lower the pH locally so be on the lookout for pitting in the plaster.

Good point,yeah I somehow thought Trichlor is basic, when you mentioned I checked the Taylor booklet,its pH is 2.8-3.5. Hopefully wont stain, I guess I need to take a chance *rock and a hard place*.

One method I've read is to put the chemical in a zip-loc bag to transport it to the stain then pour / squeeze the slurry onto the target spots.

Sounds like a good idea. Let me go check if I can get some Trichlor powder locally here. I have the pucks from last year, but dont have a holder (like this, but got bad reviews.. http://www.amazon.com/Pentair-542068...pentair+holder) or else I could just use it to scratch the floor with it to get same effect I guess. shallow ends I could srub with the puck and see if it makes any difference. I will give it a try and let you know if it makes a difference.

Also do you know why it is bad to use ammonium hydroxide with chlorine in the pool? except that pool is unusable for few weeks. I read somewhere its effective against black algae.