I made some improvements to my bonsai soil mixer, and added a few more ingredients than what I had been using. Still pretty cheap and easy. Ands I think this one will last longer.
18LB Mix Lava Rocks for Plants, Volcanic Rock Horticultural Lava Rock Soil for Landscaping Plants Drainage, Small Lava Rock Gravel for Succulents, Bonsai, Vase Fillers, Terrarium Plants, Top Dressing https://a.co/d/0bdS1FwL
Horticultural Pumice for Plants Professional Sifted (20QT, 1/4 inch) https://a.co/d/0hiWISNL
Horticultural Akadama Soil - Cactus Bonsai Succulent Soil Additive for Plants, Landscaping, Vase Fillers (18 LB, 1/4 inch) https://a.co/d/0itJWemV
15QT Organic Perlite Horticultural Soil Amendment for Plants and Enhanced Drainage Enhanced https://a.co/d/08nNfC5w