Algae problem

[Redicliff]

We have a 3.5k vinyl, endless pool. Indoor & always covered.
Over winter the water went untreated due to illness and we hoped no light would keep it clear.
However, it did develop algae growth.
Water is city water and tests ph consistently in high 7s low 8s.
We've been trying to clear this up with dosages of Lo-Chlor Pool Algaecide figuring shock dose at 8 oz. and repeated filter changes.
This isn't working. Pool remains slightly cloudy and develops slimy walls.
A couple questions:
1. can one overdose the algaecide? for effect and/or swimmer health safety
2. Other recommendations.
Thank you

 

[HermanTX]

We at TFP have a completely different view than that of pool store advice. We do not recommend algaecide.
We believe that one should self test their pool water and follow the FC/CYA Levels to maintain a clear and properly sanitized pool
If you do get algae then there is aSLAM Process which only uses liquid chlorine to clear the algae. There is no other potion to use.
The SLAM process has been proven many times on this forum but you must commit to self testing because it requires to do testing every 2-3 hours.
Please look at
Test Kits Compared

 

[Redicliff]

Wow! Thank you for that.
Much work to do.

 

[Bperry]

Wow! Thank you for that.
Much work to do.

Additionally, the algaecide tends to work better at preventing algae when chlorine is low and not stopping it once its started.