Swimming pool problem - What is orangish scaling on liner?

Question

I have a small 21' round pool. When we opened the pool this year our pump was bad and I had to wait over a week to get new one shipped; during that time we had extremely windy and warm weather for Illinois and we live in an old neighborhood with many mature trees so I got a butt load of leaves during my down time. I bought a DE filter and used algaecide (the kind designed for black algae since it seems to have way more active ingredient) and followed up with shock - 5 gallons of liquid chlorine shock and shut off the pump over night. The pool was sparking clear after three days of vacuuming and cleaning the filter.

I don't know much more than to check the ph and chlorine, which both seemed to be in the normal range. My issue is that I have what looks to be orangish dirt/scaling, it feels like sand but does not come off with just brushing, you have to really scrub. I treated it with mineral & iron removal with no luck. I used the strip tester for alkaline & tested darker then high

Answer 1

try to shock the pool really hard you may not be bringing the chlorine level high enough to kill out algae try brushing it down and vacuuming in backwash or out of filter if cartridge filter pull and wash really good before returning to filtering water also treat with an algacide not specified to a particular algae

Answer 2

try to rub it with your hans (most likely won't work) maybe something from the leaves. try vacuuming the pool and get the leaves out. call your local pool store and ask or take your pool water to be tested.

Answer 3

you can bring in a water sample to most decent pool places and they will tell you exactly what you need. it sounds like a type of algae

Answer 4

Rust would be my guess.

Answer 5

sounds like some sort of mold-like substance. OR, though unlikely, some paints feel like sand when they dry after being applied improperly like they would if they were accidently dumped into the pool.

Answer 6

ccholrine could be interacting with something else?

Answer 7

Take a sample to your local pool store & they can analyze it for you and tell you what to put in it.  They usually do it for free.