Hi all, we are new to pool ownership and still learning. Read all the articles on TFP blog, bought TF-100 XL kit, switched to liquid chlorine, etc. Our gunnite pool is partially drained right now. Have two questions: 1) should we scrub the walls with ascorbic acid or just follow the ascrobic acid procedure described in this blog, and 2) any recommendations on underwater gunnite pool patch? I enclosed a screenshot of what's available on Amazon, but I am happy to buy elsewhere.
Long version: we had to partially drain our pool because of sky-high CYA level in the pool and needing to do electrical work on the lights (lifting them out was not an option). The pool has three massive oak trees overhanging it; the trees drop acorns in it that we think contribute to high iron levels in the pool (we are on city water). After we partially drained the pool, we tested the stain with ascorbic acid and it came out instantly.
For better results, do we scrub the walls that are above water right now? Is there a way to do it that keeps the iron we scrub off from going back in the water through dripping during the scrubbing process? Or will it not make much difference, and we just follow the process from the blog after refilling? It is possible that we will need to drain and refill again because of CYA, too.
We also need to patch two places where the plaster came off the gunnite. Those are still under water. Do you have any recommendations for which product we should use for that? Local stores got nothing; there are a few choices on Amazon.
Long version: we had to partially drain our pool because of sky-high CYA level in the pool and needing to do electrical work on the lights (lifting them out was not an option). The pool has three massive oak trees overhanging it; the trees drop acorns in it that we think contribute to high iron levels in the pool (we are on city water). After we partially drained the pool, we tested the stain with ascorbic acid and it came out instantly.
For better results, do we scrub the walls that are above water right now? Is there a way to do it that keeps the iron we scrub off from going back in the water through dripping during the scrubbing process? Or will it not make much difference, and we just follow the process from the blog after refilling? It is possible that we will need to drain and refill again because of CYA, too.
We also need to patch two places where the plaster came off the gunnite. Those are still under water. Do you have any recommendations for which product we should use for that? Local stores got nothing; there are a few choices on Amazon.
