I have had an in ground concrete (pebblecrete finish) pool for 25 years. I had successfully run it for many years using Biogard Smart Sticks (chlorine). In 2014 the pool equipment needed some major overhauls and I decided to take the opportunity to automate the system as much as possible. After draining and acid washing the pool, the pool shop installed a Hydroxypure System (hydrogen peroxide and ozone), complete with a new glass bead filter, and 3 speed pump.
The system worked well for a few months, but then the problems started with algae that could not be controlled. (This was using the old hydrogen peroxide formula - I believe that they have a better product now.) After many months Waterco eventually agreed to replace the system with an automatic chlorine/acid system (Waterco's rebranded Chemigem system). The pool shop removed all the hydrogen peroxide (I assume with large amounts of chlorine), and after settling down the system ran well for several months.
Now, however, I am having problems with algae again. Previously, I could remove the algae with a shock dose, but now it comes straight back. The other problem is that, after a shock dose, and when the (dead?) algae settles on the bottom, the filter does not seem to collect the fine particles any more when I vacuum, and the pool water becomes cloudy again as it is returned to the pool.
I have decided to take control back again from the pool shop! I have bought a Taylor K-2006 test kit from the States. I am about to SLAM the pool and try to eliminate whatever is causing the problems. I noticed the thread http://www.troublefreepool.com/conte...ol-to-chlorine about converting from a Baqua pool. Is it a similar process to convert from Hydroxypure (hydrogen peroxide)? If so, how important is the step to replace the media in the filter? This was not done by the pool shop. Could that be why I am having so much trouble, and why the filter seems unable to filter out the dead algae?
Here are my latest test results: The CYA is too high for my liking (the pool shop added CYA last time they were here!). My TA and CH are also a bit low.
FC 8.5 (on the way down after shock dose)
Temp 30Deg C
Should I go straight to a SLAM, or does the filter medium need replacement? I am also going to try the Lo-Chlor Pool Sentinel to see if that helps.
Many thanks for any help. Finding this site was a real eye opener!