Help! 911 - algae showing up

[duraleigh]

You cannot test high Cl levels accurately with that OTO test. You need to get the FAS/DPD test out of your kit and use it. There is no other satisfactory way. The OTO is for testing levels of 5 or less and the dilution method is an inaccurate stop gap, at best. Also, if you are dosing accurately, you have no need to test more than once each day...simply testing for consumption...not to see if you put in enough Cl.

[let_her_flicker]

While you are shocking your pool, you need to brush your vinyl walls. Also, since you have an SWG the PH is always going to drift up. You will eventually be able to figure out a dosing strategy to keep the PH within operating parameters.

I would check the SWG thread to see if anyone talks about adding a small amount of muratic acid on a daily basis versus a lot at one time.

You may also have to make adjustments to your system to produce enough chlorine to keep FC between around 5 to 10 ppm constantly to keep algae from taking hold again based on your CYA level.

Good luck and brush those walls.

[mbar]

You can swim while shocking your pool. It won't do any damage to anyone - just wear old bathing suits, because they may fade a little.