Re: Removing Cyanuric Acid from a pool
The only easy way to remove the CYA is to drain and refill. CYA can be degraded by some anaerobic bacteria (that can flourish in a closed pool) into ammonia and other nitrogen compounds that can be very toxic to fish until they are eventually converted into nitrate (algae food). If you can establish good biological filtration in your "pond" to get rid of these nitrogen compounds and ammonia first you can then stock it with fish successfully BUT, IMHO, it is probably much easier and faster to drain and refill.
Baking soda is used in Aquaria to increase TA just like in a pool so it should not be a problem as long as the TA is adjusted to a range you fish are happy with.
Chlorine is the least of the problems and the easiest to deal with. Shock and expose to sunlight to destroy any CC then let the chlorine drop to 0.
If you ever used any algaecide it could be a problem, depending on what is left in the water. For fish ponds, believe it or not, copper is probably the least problematic for fish as long as the levels are not too high.
11.75'x23.75' kidney 6.5K gal IG fiberglass pool/300 gal acrylic spillover spa combo; Aqualogic automation/SWCG; Pentair Clean and Clear 150 cart filter; 1.5 hp uprated 2 spd Pentair Whisperflo pump; PF:17
Retired pool store and commercial pool maintenance guy.