My pool is 1.5 yrs old and all I have ever done to it is add salt and shock it twice. I test water frequently and for the most part it is within parameters when I test the salinity and PH / Chlorine. PH does vary and I bring it up and down with PH minus and plus.
I have noticed lately that the bottom 4 tiles have a cloudy haze over them when the sun hits it just right, it felt a little slimy and when rubbed with a brush, whatever is there came right off, leaving the tile sparkling.
I have 8" x 8" tiles in my pool, I am now intimately familiar with each tile as I hand brushed every one of them.
Even before I noticed the haze on the tile, when you look at my pool, it looks sparkling clean but if you go underwater with a mask and look from one end to the other, it looks like dust in the water but after brushing it was significantly worse. I let the water go still and then turn the lights on at night, it looked like a dust blizzard going by the lights. The next day I gave it a good vacuuming and it almost seemed like the filter is just not catching those minute particles or they are going through the filter too fast to hold them.
Against my better judgement, I tried a flocculant for the first time, I added 700 ML by mixing it in my garden sprayer and getting a nice even coating over the entire pool surface. Then left the pool off for 48 hrs.
It was amazing how much brown encapsulated dust was on the bottom, so I carefully vacuumed that to waste and there was surely a significant improvement in clarity but after vacuuming I could still see some flocs in the water column so I am letting it sit for another 24 hrs and will give the final vacuum before going back to the regular filtering cycle.
I now swear by flocculating if you have significant suspended solids.
NOW.....I am not sure why I had the, what I call, dust in the water problem to start with, then it increased significantly after brushing which is to be expected.
If the pool remains clear, that will be GREAT, but if I still have dust........I was thinking to change out the glass filter media and go with the Zelbrite filter media.
When I talked to the pool store today to price the Zelbrite, they told me to wait and see if it happens again and to what degree.
I live in Chinag Mai Thailand and right now the air quality is bad, partly from pollution and partly from farmers burning the rice field to prepare for the next crop and the pool store said many customers are asking the same question as me regarding what looks like dust floating throughout the entire water column.
Zelbrite here is 37.00 USD for a 15 Kg bag (33 pounds) how does that price compare with other places. This particular pool store is probably the highest prices in this area.
Bottom Line - don't be afraid to Flocculate if you need to, follow the instructions and remember, Flocking is NOT a place where MORE is better. Make SURE to vacuum to waste after flocking and give it 48 hrs to settle out.