Hello, I am new here and have a problem with a white gritty substance on my pool walls no one can seem to figure out. Hoping to get some answer to try to correct it.

I have a 16' X 48' in ground, vinyl liner pool. I opened the pool on May 20th. At opening was extremely dark green. i have shocked it continuously since then about every 2 days, starting with calcium based granules, then switching to sodium based liquid.

The algae is all dead, and the water is a light blue with alot of cloudiness, however every day it clears up more. i run my sand filter 24/7 and back wash about once a day.

A white grit, kind of like 'scotch tape with white sand' in it, is coating my entire pool walls and bottom. It is really abrasive in spots. It is somewhat clear, you can see through it, but I can only get very small spots off. I have scrubbed, even scraped with a rubber squigee and can only get off a very little bit at a time and it is coating my entire pool.

I have never had this issue in 7 years. I went to a local pool company and they keep giving me different chemicals to try, but I dont think they know what it is. my water is clearing and for the first time, i can see the bottom, just this bad white grit issue is all thats left.



Here are my today water test readings:
free aval chlorine: 5.72
Tot chlorine: 10.31 (just shocked again last night)
combined chlorine: 4.59
tot alkalinity: 170
ph: 6.9 (was balanced to 7.5 4 days ago)
cal hardness: 342
cyranic acid: 14
total dissolved solids: 1280
saturated index: -0.4

heres what they told me today:

add 1.5 gallon of muratic acid
add 40oz enzymes (they think it may be white water mold??)
scrub walls

then, add ph increaser

then shock again.


Can anyone out there help me?? i am desperate and i dont think its white water mold, I know there must be a solution for this,