Having issues controlling PH in a small pond
I've got a small pond (150gal) with 8x 4-5 inch koi 10 Japanese trapdoor snails and 3 plants. It has a filter I clean every few days and a UV light. I also do a 10% water change weekly.
*going more plants and do a bigger pond next year
I was doing tap water (250~ ppm) with a high amount of lime and figured it was the lime making the high PH (8.3~) I tried citric acid but it would only last a day or two.
I then tried a 90% rain water change (was 56 PPM and and has been siting in a large 1000gallon cistern for a few years (10-12) had no bad smell. After 3 days it hit 9.3 I just added some citric acid if it doesn't work I'm out of ideas.