u/Holiday_Lie_9948

My pool is getting green, kind of out of the sudden.

for years it did not have any issues at all, even if left untreated for a few weeks.

I have a pool company taking care of it, so I don’t know the chemicals, but a few things have changed recently so I wanted to check if any of these could have caused the problem:

- the pool guy is different now ( same company and he look very experienced, so I don’t think it’s because of him, but things started to turn green around the time he took over)

- I changed my filter of the jandy cl460 with cheap aftermarket

- I had some work a few months earlier. some debris stayed in the pool for a while before being removed and I bow I have a few stains because of that ( maybe concrete stains or I don’t know what else)

- I changed the pump with a VS pump. I doubt the pump time is the issue, but I am increasing speed and time just in case.

any of these ring a bell for a sudden green problem which I never had before?

I have normal glulam beams typically used for interior application, but it has ASTM D2559 glue.

for my driveway bridge, I have the option to buy the yellow cedar architectural grade beam which is the more common recommended beam for outdoor applications. However, it costs more than 2x.

I will likely lean towards a mix of both beams, but I am wondering if any expert in this area can confirm that the normal glulam beam I have will be safe from glue failures if I used it outdoor since it uses a an exterior graded glue.

however, if I could confirm that the more expensive options for glulam beam are better just at the wood decay, but equivalent when it comes to glue failures, I might avoid the expensive cedar. wood decay is visible and I can take actions overtime. glue deterioration is not visible and could cause sudden failure.